# How do you check if a number is perfect or not?

## How do you check if a number is perfect or not?

A number is a perfect number if is equal to sum of its proper divisors, that is, sum of its positive divisors excluding the number itself. Write a function to check if a given number is perfect or not. Examples: Input: n = 15 Output: false Divisors of 15 are 1, 3 and 5.

What is the algorithm for perfect number?

Algorithm to check Perfect number: Go through every number from 1 to n/2 and check if it is a divisor. Maintain the sum of all divisors. If the sum becomes equal to n, then the number will be a perfect number else it will be not a perfect number.

### Is 2096128 a perfect number?

The reason 2096128 isn’t a perfect number is because that part in parentheses, 211 – 1 (which is 2047), isn’t itself prime! 2047 can be factored: 23 * 89, and therefore it isn’t prime.

What is perfect number example?

perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128. The discovery of such numbers is lost in prehistory.

## Is 7 a perfect number?

A Perfect Number “n”, is a positive integer which is equal to the sum of its factors, excluding “n” itself….Perfect Number Table:

Prime, p Mersenne Prime, 2p -1 Perfect Number, 2p-1(2p -1)
7 127 8128
13 8191 33550336
17 131071 8589869056
19 524287 137438691328

What are the perfect numbers from 1 to 100?

There are only 2 perfect numbers from 1 to 100 which are 6 and 28.

### How do you check whether a number is perfect number or not in Python?

n = int(input(“Enter any number: “)) sum1 = 0 for i in range(1, n): if(n % i == 0): sum1 = sum1 + i if (sum1 == n): print(“The number is a Perfect number! “) else: print(“The number is not a Perfect number! “)

Is 33550336 a perfect number?

A Perfect Number is a natural number such that its value is equal to the sum of its proper divisors. The first seven Perfect Numbers are: 6, 28, 496, 8128, 33550336, 8589869056, 137438691328.

## Is 8128 a perfect number?

perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128.

Why is 7 a perfect number?

Seven is the number of completeness and perfection (both physical and spiritual). It derives much of its meaning from being tied directly to God’s creation of all things.

### Is 64 a perfect number?

In base 10, no integer added up to its own digits yields 64, hence it is a self number. 64 is a superperfect number—a number such that σ(σ(n)) = 2n.