# Is Perfect Number

This algorithm checks whether a given number is perfect number or not. Perfect number is a number which is equal to sum of its divisor. For example divisors of 6 are 1,2 and 3. The sum of these divisors is 6. So 6 is called as perfect number.

` ````
public static bool IsPerfectNumber(int number)
{
int sum = 0;
int i = 1;
while (i < number)
{
if (number % i == 0)
sum += i;
++i;
}
return sum == number;
}
```

### Example

` ``bool isPerfectNumber = IsPerfectNumber(28);`

### Output

` ``true`