507. Perfect Number

Description

We define the Perfect Number is a positive integer that is equal to the sum of all its positive divisors except itself.

Now, given an integer n, write a function that returns true when it is a perfect number and false when it is not.

Example 1:

Input: 28
Output: True
Explanation: 28 = 1 + 2 + 4 + 7 + 14

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