19 numbers
Factors for 24 are: 1, 2, 3, 4, 6, 8, 12, 24
Factors for 30 are: 1, 2, 3, 5, 6, 10, 15, 30
Factors for 36 are: 1, 2, 3, 4, 6, 9, 12, 18, 36
Factors for 40 are: 1, 2, 4, 5, 8, 10, 20, 40
Factors for 42 are: 1, 2, 3, 6, 7, 14, 21, 42
Factors for 48 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 48
Factors for 54 are: 1, 2, 3, 6, 9, 18, 27, 54
Factors for 56 are: 1, 2, 4, 7, 8, 14, 28, 56
Factors for 60 are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
Factors for 66 are: 1, 2, 3, 6, 11, 22, 33, 66
Factors for 70 are: 1, 2, 5, 7, 10, 14, 35, 70
Factors for 72 are: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
Factors for 78 are: 1, 2, 3, 6, 13, 26, 39, 78
Factors for 80 are: 1, 2, 4, 5, 8, 10, 16, 20, 40, 80
Factors for 84 are: 1, 2, 3, 4, 6, 7, 12, 14, 21, 28, 42, 84
Factors for 88 are: 1, 2, 4, 8, 11, 22, 44, 88
Factors for 90 are: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90
Factors for 96 are: 1, 2, 3, 4, 6, 8, 12, 16, 24, 32, 48, 96
Factors for 100 are: 1, 2, 4, 5, 10, 20, 25, 50, 100
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360, 420 and 480 each have 24 factors.
144, 121 and 100
the number is 350 the factors is 175 and 2
-1
1 is the number less than fifty with the fewest number of factors. All other numbers have at least two factors (1, and the integer itself).