perfect number

Etymology
, with this use of itself a semantic loan from.

Noun

 * 1)  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.
 * 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.

Translations

 * Catalan: nombre perfecte
 * Chinese:
 * Mandarin:
 * Dutch: perfect getal
 * Finnish: täydellinen luku
 * French:
 * German: vollkommene Zahl, perfekte Zahl, ideale Zahl
 * Icelandic: fullkomin tala
 * Irish:
 * Old Irish: áram foirbthe
 * Italian:
 * Japanese: 完全数 (かんせんすう; kanzen-su)
 * Latin: numerus perfectus
 * Norwegian: perfekt tall
 * Portuguese: número perfeito
 * Romanian:
 * Russian:
 * Slovak: dokonalé číslo
 * Spanish: número perfecto
 * Swedish:
 * Tagalog: himpit na bilang
 * Turkish: mükemmel sayı