Perfect Numbers

A perfect number is a number that can be formed by adding its proper divisors (excluding itself). Create a function that accepts a number and returns True if the number is a perfect number, and False if it is not.

Example

NumberDivisorsSum of DivisorsIs Perfect Number
61, 2, 3, 6*1 + 2 + 3 = 6True
281, 2, 4, 7, 14, 28*1 + 2 + 4 + 7 + 14 = 28True
71, 7*1 = 1False

* A proper divisor is a positive divisor that is not the number itself.