Perfect number. Perfect number, a positive integer that is equal to the sum of its proper divisors. The smallest perfect number is 6, which is the sum of 1, 2, and 3. Other perfect numbers are 28, 496, and 8,128.
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Equivalently, the number 6 is equal to half the sum of all its positive divisors: ( 1 + 2 + 3 + 6 ) / 2 = 6. The next perfect number is 28 = 1 + 2 + 4 + 7 + 14. This is followed by the perfect numbers 496 and 8128 (sequence A000396 in the OEIS).
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Perfect Number -- from Wolfram MathWorld
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by EW Weisstein - 2003 - Cited by 8 - Related articles
For example, the first few perfect numbers are 6, 28, 496, 8128, ... (OEIS A000396) .... "Perfect Numbers." §B1 in Unsolved Problems in Number Theory, 2nd ed.
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