C program to check if number is Perfect number or not

Explanation:

A number is said to be perfect number if sum of its proper divisors is equal to number itself.

e.g: 28

Proper divisors = 1,2,4,7,14

Sum of proper divisors = 1 + 2 + 4 + 7 + 14 = 28

So, 28 is a perfect number.

Program:

#include<stdio.h>

int main()

{

int n,i,sum=0;

printf("\nEnter number to be checked: ");

scanf("%d",&n);

for(i=1;i<n;i++)

{

if(n%i==0)

{

                    sum=sum+i;

}

}

if(sum==n)

{

printf("\nIt is a Perfect Number");

}

else

{

printf("\nIt is NOT a Perfect Number");

}

return 0;

}

Output: