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Perfect Number
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A "perfect" number is a number which is equal to the sum of all it's divisors. The first perfect number is 6 (3 + 2 + 1 = 6). What is the second perfect number?

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The second perfect number is 28, which is the sum of its divisors.

14 + 7 + 4 + 2 + 1 = 28

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