You could use two threes and two ones, but it's more likely you were looking for -9. That would be 9 and -1.
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8 has more factors than 9 does.
In the absence of a specific number, 8, 9, 10 and 11 can all be factors. In fact, they're all factors of 3960.
The factors of 8 are 1, 2, 4, and 8 The factors of 18 are 1, 2, 3, 6, 9, and 18
5, 6, 8, and 9 share no common factors aside from 1.
12 distinct factors: 1 2 3 4 6 8 9 12 18 24 36 72.