A whole number that is equal to the sum of its positive factors, excluding the number itself.

Example: 28

Its positive factors are {1, 2, 4, 7, 14, 28}. Excluding the 28 the sum is 1 + 2 + 4 + 7 + 14 = 28, so 28 is a Perfect Number.

Example: 28

Its positive factors are {1, 2, 4, 7, 14, 28}. Excluding the 28 the sum is 1 + 2 + 4 + 7 + 14 = 28, so 28 is a Perfect Number.

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