English
hyperperfect number
From hyper- + perfect number.
Formed from hyper- + perfect number
Proto-Indo-European *úp
Proto-Indo-European *upér ‘over, above’
Proto-Hellenic *hupér
Ancient Greek ὑπέρ ‘over’
English hyper-
Proto-Indo-European *kʷél-os ~ *kʷél-es-
Proto-Hellenic *kʷélos
Ancient Greek τέλος ‘end’
Ancient Greek τέλειος ‘complete, perfect, entire, without blemish’
English perfect number
Today it means
noun Any natural number n for which, for some positive integer k, n = 1 + k(σ(n) - n - 1), where σ(n) is the sum of the positive divisors of n.
Language periods are conventional ranges, not dates for this word.
Etymograph / hyperperfect number