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class Solution:
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    def checkPerfectNumber(self, num: int) -> bool:
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        sum = 0
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        root = num**0.5
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        if num == 1:
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            return False
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        for i in range(2, int(root) + 1):
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            if num % i == 0:
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                sum += (num // i) + i
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        return sum + 1 == num