Hi, here's your problem today. This problem was recently asked by Facebook:
A Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself.
For instance, 28 = 1 + 2 + 4 + 7 + 14
Write a function to determine if a number is a perfect number.
class Solution(object): def checkPerfectNumber(self, num): # Fill this in.