0
Anonymous
More than two numbers go into 1640 - excluding 1 and 1640, 2, 5 and 41:
2 x 2 x 2 x 2 x 5 x 41 = 1640.
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7 and 9 are two numbers that go into 63.
52
2 numbers that can go into 280 are 2 and 8 but there are way more though.
3, 17
2 and 41