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$ 80 $ is the integer that proceeds 79 and precedes 81. Its prime factorization is $ 2^4*5 $. Its factors are 1, 2, 4, 5, 8, 10, 16, 20, and 40. Because of the number of factors, it is a very common number. A number is divisible by 80 if it is divisible by 5 and 16.