perfect number

English

Etymology

Calque of LatinCategory:English terms calqued from Latin#PERFECTNUMBERCategory:English terms derived from Latin#PERFECTNUMBER numerus perfectus, with this use of perfectus itself a semantic loan from Ancient GreekCategory:English terms derived from Ancient Greek#PERFECTNUMBER τέλειος (téleios).

Pronunciation

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Category:Requests for pronunciation in English entries#PERFECTNUMBER

Noun

perfect number (plural perfect numbers)Category:English lemmas#PERFECTNUMBERCategory:English nouns#PERFECTNUMBERCategory:English countable nouns#PERFECTNUMBERCategory:English multiword terms#PERFECTNUMBERCategory:English entries with incorrect language header#PERFECTNUMBERCategory:Pages with entries#PERFECT%20NUMBERCategory:Pages with 1 entry#PERFECT%20NUMBER

  1. (number theoryCategory:en:Number theory#PERFECTNUMBER) A number that is the sum of all of its divisors except itself.
    The factors of 6 are 1, 2, 3 and 6, and 1 + 2 + 3 = 6, so 6 is a perfect number.Category:English terms with usage examples#PERFECTNUMBER
    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.Category:English terms with usage examples#PERFECTNUMBER

Derived terms

Translations

See also

Category:English countable nouns Category:English lemmas Category:English multiword terms Category:English nouns Category:English terms calqued from Latin Category:English terms derived from Ancient Greek Category:English terms derived from Latin Category:English terms with audio pronunciation Category:English terms with usage examples Category:Entries with translation boxes Category:Mandarin terms with redundant transliterations Category:Pages with 1 entry Category:Pages with entries Category:Requests for pronunciation in English entries Category:Terms with Catalan translations Category:Terms with Dutch translations Category:Terms with Finnish translations Category:Terms with French translations Category:Terms with Galician translations Category:Terms with German translations Category:Terms with Icelandic translations Category:Terms with Italian translations Category:Terms with Japanese translations Category:Terms with Korean translations Category:Terms with Latin translations Category:Terms with Mandarin translations Category:Terms with Norwegian Bokmål translations Category:Terms with Old Irish translations Category:Terms with Polish translations Category:Terms with Portuguese translations Category:Terms with Romanian translations Category:Terms with Russian translations Category:Terms with Slovak translations Category:Terms with Spanish translations Category:Terms with Swedish translations Category:Terms with Tagalog translations Category:Terms with Turkish translations Category:en:Number theory