perfect number

noun

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

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Example Sentences

Recent Examples on the Web The 32-team lineup is the perfect number for a knockout bracket. Bloomberg.com, 30 Mar. 2022 The 32-team lineup is the perfect number for a knockout bracket. Graham Dunbar, ajc, 30 Mar. 2022 The 32-team lineup is the perfect number for a knockout bracket. Graham Dunbar, Chron, 30 Mar. 2022 Traversing the landscape of contemporary electronic music (with the perfect number of moments to dance), the album is the perfect introduction to Lee’s talents. Britt Julious, chicagotribune.com, 6 Sep. 2021 In every conceivable way, Van Basten was the perfect number nine. SI.com, 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, 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, 5 Sep. 2017 See More

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.

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Word History

First Known Use

14th century, in the meaning defined above

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

Dictionary Entries Near perfect number

Cite this Entry

“Perfect number.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/perfect%20number. Accessed 28 Sep. 2022.

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