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bn:01692049n
Noun Concept
Categories: Integer sequences, Articles with short description, All articles containing potentially dated statements, Divisor function, Unsolved problems in number theory
EN
perfect number  33550336  8589869056  191561942608236107294793378084303638130997321548169216  191 561 942 608 236 107 294 793 378 084 303 638 130 997 321 548 169 216
EN
In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. Wikipedia
Definitions
Examples
Relations
Sources
EN
In number theory, a perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. Wikipedia
Positive integer which equals the sum of all its divisors Wikidata
A number that is the sum of all of its divisors except itself. Wiktionary
EN
The factors of 6 are 1, 2, 3 and 6, and 1 + 2 + 3 = 6, so 6 is a perfect number. Wiktionary
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. Wiktionary
IS A
composite number
natural number
harmonic divisor number
even number
HAS INSTANCE
twenty-eight
six
496
8128
33550336
DESCRIBED BY SOURCE
Armenian Soviet Encyclopedia
Otto's encyclopedia
Wikipedia
EN
perfect number
Wikidata
EN
perfect number
Wiktionary
EN
perfect number
Wikipedia Redirections
EN
191561942608236107294793378084303638130997321548169216 (number), 191 561 942 608 236 107 294 793 378 084 303 638 130 997 321 548 169 216, 33550336, 8589869056, Conditions for the existence of odd perfect numbers, even perfect number, odd perfect number, Perfect Number, perfect numbers, Perfect odd number

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