Perfect Number

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:
Input: 28
Output: True
Explanation: 28 = 1 + 2 + 4 + 7 + 14
Note: The input number n will not exceed 100,000,000. (1e8)

class Solution {public:    bool checkPerfectNumber(int num) {        if(num == 1)            return false;        int count = 1;        for(int i = 2; i * i <= num ; ++i){            if(i*i == num)                count+=i;            else{                if(num%i==0)                    count = count + i + num/i;            }        }        return count==num?true:false;    }};