Perfect number

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

Output:
Enter the number:25
25 is not a perfect number