Other than 6 what is another perfect number?

Another perfect number is 28. A perfect number is defined as a positive integer that is equal to the sum of its proper divisors, excluding itself. For 28, its proper divisors are 1, 2, 4, 7, and 14, which sum to 28. Perfect numbers are generated from even numbers using the formula (2^{p-1} \times (2^p - 1)) when (2^p - 1) is a Prime number, with 28 corresponding to (p = 3).