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.

• C#
• VB.Net
• C
• C++
• PHP

									function IsPerfectNumber($number)
{
	$sum = 0;
	$i = 1;

	while ($i < $number)
	{
		if ($number % $i == 0)
			$sum += $i;

		$i++;
	}

	return $sum == $number;
}
								

Example

									$isPerfectNumber = IsPerfectNumber(28);
								

Output

									True