you can break 800 in
2*2*2*2*2*5*5 = 2^5 * 5^2
so its divisible by any combination of multiplying numbers 2,2,2,2,2,5,5 where you can you only one in each combo.
so:
1
2
2*2=4
2*2*2=8
2*2*2*2=16
2*2*2*2*2=32
2*5=10
2*2*5=20
2*2*2*5=40
2*2*2*2*5=80
2*2*2*2*2*5=160
2*5*5=50
2*2*5*5=100
2*2*2*5*5=200
2*2*2*2*5*5=400
2*2*2*2*2*5*5=800
5
5*5=25
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No
Yes. The result is 160.
858, which is 66 x 13
603, 606, ... (64 more of them).
1, 2, 4, 5, 8, 10, 16, 20, 25, 32, 40, 50, 80, 100, 160, 200, 400, 800