Dictionary

perfect number

noun

Definition of PERFECT NUMBER

:  an integer (as 6 or 28) the sum of whose integral factors including 1 but excluding itself is equal to itself

First Known Use of PERFECT NUMBER

14th century

Browse

Next Word in the Dictionary: perfectoPrevious Word in the Dictionary: perfectlyAll Words Near: perfect number
March 28, 2015
persiflage Hear it
Frivolous bantering talk
Take a 3-minute break and test your skills!
How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears