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perfect number

Noun CEFR B2

Definitions

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

Equivalents

10 more languages

Examples

“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⟳.”

CEFR level

B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
See all B2 English words →

See also

perfect octave perfect participle perfect passive participle perfect pitch perfect power perfect price discrimination

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