1, 2, 4, 5, 8, 10, 16, 20, 32, 40, 64, 80, 128, 160, 320, 640
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There's only one number that equals 640. The number is . . . . . 640.
640 ÷ 8 = 80
No, it does not.
Both of these are acceptable for 640:2 x 2 x 2 x 2 x 2 x 2 x 2 x 5 = 64027 x 5 = 640
71.1111 times.