(number theory) abundant number, a number that is smaller than the sum of its proper divisors

(number theory) perfect number, a positive integer that is equal to the sum of its positive divisors, excluding the number itself

(number theory) deficient number, a number for which the sum of proper divisors is less than that number

(number theory) amicable numbers, two different numbers related in such a way that the sum of the proper divisors of each is equal to the other number.

(Internet) play count

unlucky number

generation of a royal family / era, age, decade

charge, fare, rate, fee, price, rent / (indicating years spanning a specific period) -ies, -hundreds

machines, especially vehicles or computers

tables, beds / level, especially of price / period of time in a person's life