- What numbers can go into 70?
- Is 13 a happy number?
- How many divisors does 72 have?
- Is 72 prime or composite?
- What are the total number of divisors of 600 including 1 and 600 )?
- How do you find the number of divisors?
- Is 70 a perfect square?
- How many divisors does 1000 have?
- What is the scariest number?
- How many divisors does the number 70 have?
- What is the weirdest number?
- Is 72 a perfect number?
- Is 1 a divisor of all numbers?
- IS 400 a perfect square?
- Why is 70 a weird number?

## What numbers can go into 70?

70 is a composite number.

70 = 1 x 70, 2 x 35, 5 x 14, and 7 x 10.

Factors of 70: 1, 2, 5, 7, 10, 14, 35, 70.

Prime factorization: 70 = 2 x 5 x 7..

## Is 13 a happy number?

The first few happy numbers are 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, … … (OEIS A007770).

## How many divisors does 72 have?

What is the list of divisors from 1 to 100?NumberList of DivisorsDivisors of 701,2,5,7,10,14,35,70Divisors of 711,71Divisors of 721,2,3,4,6,8,9,12,18,24,36,72Divisors of 731,7396 more rows

## Is 72 prime or composite?

If the factors of 72 are only 72 and 1, then we know that 72 is a prime number. Otherwise, 72 is a composite number. To explain better, if 72 is only divisible by 1 and 72, then it is a prime number, and if 72 is divisible by more than 72 and 1, then it is a composite number.

## What are the total number of divisors of 600 including 1 and 600 )?

The divisors of 600 are 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 25, 30, 40, 50, 60, 75, 100, 120, 150, 200, 300 and 600 itself. That’s a total of 24 divisors.

## How do you find the number of divisors?

Let d( n ) be the number of divisors for the natural number, n . We begin by writing the number as a product of prime factors: n = p a q b r c … then the number of divisors, d( n ) = ( a +1)( b +1)( c +1)… To prove this, we first consider numbers of the form, n = p a .

## Is 70 a perfect square?

A: No, the number 70 is not a perfect square.

## How many divisors does 1000 have?

Total number of divisors of 1000 are 16 including 1 and 1000. We want divisors of 1000 including 1 but excluding 1000 so answer is 15.

## What is the scariest number?

Phone Numbers666-666-6666 or 1-666-666-6666. For years, people all over the world have been receiving creepy messages from the phone numbers 666-666-6666 or 1-666-666-6666. … 999-9999. According to an urban legend in Thailand, 999-9999 is a cursed number. … Red Numbers. … 090-4444-4444. … 0888 888 888. … 1-000-000-0000. … 666. … 1 (207) 404-2604.More items…•

## How many divisors does the number 70 have?

1 to 100nDivisorsNotes691, 3, 23, 69deficient, composite701, 2, 5, 7, 10, 14, 35, 70abundant, composite, weird711, 71deficient, prime721, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72abundant, highly abundant, composite72 more rows

## What is the weirdest number?

Examples. The smallest weird number is 70. Its proper divisors are 1, 2, 5, 7, 10, 14, and 35; these sum to 74, but no subset of these sums to 70. The number 12, for example, is abundant but not weird, because the proper divisors of 12 are 1, 2, 3, 4, and 6, which sum to 16; but 2 + 4 + 6 = 12.

## Is 72 a perfect number?

For 72, the answer is: No, 72 is not a prime number. The list of all positive divisors (i.e., the list of all integers that divide 72) is as follows: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72. For 72 to be a prime number, it would have been required that 72 has only two divisors, i.e., itself and 1.

## Is 1 a divisor of all numbers?

1 and −1 divide (are divisors of) every integer. Every integer (and its negation) is a divisor of itself. … A non-zero integer with at least one non-trivial divisor is known as a composite number, while the units −1 and 1 and prime numbers have no non-trivial divisors.

## IS 400 a perfect square?

A number is a perfect square (or a square number) if its square root is an integer; that is to say, it is the product of an integer with itself. Here, the square root of 400 is 20. Therefore, the square root of 400 is an integer, and as a consequence 400 is a perfect square.

## Why is 70 a weird number?

Weird numbers are natural numbers that are abundant but not semiperfect. For example, 70 is the lowest weird number, because its set of proper divisors {1,2,5,7,10,14,35} sum to 74, but no subset of its set of proper divisors sum to the number 70, and 70 is the smallest number to meet such conditions.