help calculating perfect numbers

ok so im trying to write a program that calculates the third perfect number but i only reached as far as to calculate if a number is perfect:

Code:

#include <iostream>
using namespace std;
int main()
{

int pernum, total = 0; 

cout << "Enter an interger: ";
cin >> pernum;

for (int i = 1; i < pernum; ++i) 
{ 
if (pernum % i == 0) 
total += i; 
} 
 
if (pernum == total) 
    cout << "Your number is a perfect number!" << endl; 
else 
    cout << "Your number is not a perfect number" << endl; 

return 0;
}

i was just wondering where do i go from here to get the third perfect number which is 496

*shrug*

Without a "bignum" library you'll hit a wall before the sixth number.

That said, Euclid provides a algorithm to discover all even perfect numbers.

Soma