perfect number

perfect number

perfect number Word Origin noun Mathematics.

  1. a positive number that is equal to the sum of all positive integers that are submultiples of it, as 6, which is equal to the sum of 1, 2, and 3.

Compare abundant number, deficient number. Origin of perfect number Middle English word dating back to 1350–1400 British Dictionary definitions for perfect number perfect number noun

  1. an integer, such as 28, that is equal to the sum of all its possible factors, excluding itself

perfect number in Science perfect number

  1. A positive integer that equals the sum of all of its divisors other than itself. An example is 28, whose divisors (not counting itself) are 1, 2, 4, 7, and 14, which added together give 28.

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