perfect number

noun

Definition of perfect number

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

Examples of perfect number in a Sentence

Recent Examples on the Web In every conceivable way, Van Basten was the perfect number nine. SI.com, "Arrigo Sacchi: The AC Milan Legend's All-Time Best XI," 15 Aug. 2019 There was always the perfect number of raisins per slice, mostly scattered across and sometimes in greedy clumps. Zoë Sessums, Bon Appetit, "This Cinnamon Raisin Bread Did More for My Love Life Than Tinder," 6 Apr. 2018 Roma legend Francesco Totti has described what would make his 'perfect number 10', choosing attributes from various legends of the game, past and present, to do so. SI.com, "VIDEO: Francesco Totti Creates His Perfect #10 by Picking the Best Attributes From Various Legends," 5 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'perfect number.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of perfect number

14th century, in the meaning defined above

Keep scrolling for more

Learn More about perfect number

Time Traveler for perfect number

Time Traveler

The first known use of perfect number was in the 14th century

See more words from the same century

Statistics for perfect number

Cite this Entry

“Perfect number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/perfect%20number. Accessed 13 Aug. 2020.

More from Merriam-Webster on perfect number

Britannica.com: Encyclopedia article about perfect number

Comments on perfect number

What made you want to look up perfect number? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

Test Your Vocabulary

Original Meanings Quiz

  • rembrandt painting a young scholar and his tutor
  • Which of the following is the earliest known sense of the word awe?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Bee Cubed

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!