# perfect number

> English word · Noun

## Definitions
1. A number that is the sum of all of its divisors except itself.

## Etymology
Calque of Latin numerus perfectus, with this use of perfectus itself a semantic loan from Ancient Greek τέλειος (téleios).

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/perfect-number