WordNet sense 1 (a short theatrical performance that is part of a longer program):

act, bit, routine, turn

WordNet sense 2 (a symbol used to represent a number):

numeral

WordNet sense 3 (one of a series published periodically):

issue

WordNet sense 4 (the number is used in calling a particular telephone):

phone number, telephone number

WordNet sense 5 (a numeral or string of numerals that is used for identification):

identification number

WordNet sense 6 (the property possessed by a sum or total or indefinite quantity of units or individuals):

figure

WordNet sense 7 (put into a group):

count

WordNet sense 8 (add up in number or quantity):

amount, come, total, add up

WordNet sense 9 (determine the number or amount of):

enumerate, numerate

WordNet sense 10 (enumerate):

list

WordNet sense 11 (place a limit on the number of):

keep down