Word Pronunciation & Dictionary

perfect number

Word Rarity Common

Frequency: Zipf frequency 5.06 in modern English

Syllables: per-fec-t num-ber
IPA

24

Scrabble Score

13

Letters

4

Syllables

10

Unique Chars

Meaning

noun

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

Example Sentences

"The factors of 6 are 1, 2, 3 and 6, and 1 + 2 + 3 = 6, so 6 is a perfect number."
"The factors of 28 are 1, 2, 4, 7, 14 and 28, and 1 + 2 + 4 + 7 + 14 = 28, so 28 is a perfect number."

Etymology

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

Origin

Source language: Ancient Greek

Word Breakdown

Root: τέλειος

Inflected Forms

perfect numbers (plural)

Phrases

hyperperfect number abundant number amicable numbers deficient number Mersenne prime sociable numbers

Frequently Paired Words

abundant number amicable numbers deficient number Mersenne prime sociable numbers

Questions

What does perfect number mean?: A number that is the sum of all of its divisors except itself.
Where does perfect number come from?: It is traced to Ancient Greek.

How to pronounce perfect number

Open the pronunciation page — Open the Speakur entry for “perfect number”.
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