Usually means: Number nearly equal to divisors sum.
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We found 5 dictionaries that define the word almost perfect number:

General (1 matching dictionary)
  1. Almost perfect number: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. almost-perfect number, Almost perfect number: Encyclopedia

Science (2 matching dictionaries)
  1. Almost Perfect Number: Eric Weisstein's World of Mathematics
  2. almost perfect number: PlanetMath Encyclopedia

Definitions from Wikipedia (Almost perfect number)

noun:  In mathematics, an almost perfect number (sometimes also called slightly defective or least deficient number) is a natural number n such that the sum of all divisors of n (the sum-of-divisors function σ(n)) is equal to 2n − 1, the sum of all proper divisors of n, s(n) = σ(n) − n, then being equal to n − 1.


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