Perfect Number

What is a Perfect number?

A perfect number is defined to be one which is equal to the sum of all its divisible number. For example let us consider a number 6, the numbers which are all divisible by 6 are 1, 2, 3. Then 1 + 2 + 3 = 6 . Thus 6 is a perfect number.

Perfect Number - Examples

Some of the following perfect numbers are

C Program - To Find a Perfect Number

Let us write a c program to find whether a user entered number is a perfect number or not.

#include <stdio.h>
int main()
{
int a, b, num;
printf("Enter a number : ");
scanf("%d",&num);
a = 1;
b = 0;
while(num > a)
{
if(num % a == 0)
b = b + a;
a++;
}
if(b == num)
printf("\n%d is a perfect number", a);
else
printf("\n%d is not a perfect number", a);
return 0;
}

Enter a number : 28
28 is a perfect number

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