| 单词 | perfect number |
| 释义 | perfect numbernoun Mathematics.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 numberMiddle English word dating back to 1350–1400 Words nearby perfect numberperfectionism, perfectionist, perfective, perfectivize, perfectly, perfect number, perfecto, perfector, perfector press, perfect participle, perfect pitch Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for perfect numberperfect number nounan integer, such as 28, that is equal to the sum of all its possible factors, excluding itself Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Scientific definitions for perfect numberperfect number 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. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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