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16 is not a perfect number as defined by Euchlid and Euler.

6 is a perfect number, by their definition, because it is the sum of all its proper positive divisors - all numbers that will divide into the number excluding itself - (1 + 2 + 3) = 6, and equal to half the sum of all its positive divisors, including itself (1 + 2 + 3 + 6)/2 = 6.

28 is the next number. There is still an unsolved mystery in number theory as to whether there can be an odd perfect number.

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13y ago

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