(mathematics) A number whose decimal representation of its square ends in itself.

(number theory) Any of a series of numbers formed from the sum of the reciprocals of consecutive natural numbers

(physics) The number of neutrons in the nucleus of an atom or isotope. Symbol: N

Alternative spelling of number cruncher

plural of number cruncher

An accountant or other person who deals with the calculation of numbers as a profession. / (computing) A program, algorithm, or hardware with a focus on numerical calculation.

(grammar) A word that answers "how many times each?" or "how many at a time?"

(number theory) One of a pair of numbers having the property that the sum of the divisors of each, excluding itself, is equal to the other number.

(physics) A quantum number related to the difference between the numbers of quarks and antiquarks in a system of subatomic particles

(mathematics) Any integer that is the sum of n natural numbers from 1 to n.