(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

(of size or amount) small, little, tiny / (of age) young, little

to show, to make apparent / to express, to put into words / to signify, to represent, to symbolize, to stand for

to express, to say in words, to put into words

zero-sum

zero (number) / (informal) Used to refer to something measurable being absent or missing.