1, 3 and 9.
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1, 3, 7, 9, 21, 63
3 goes into 36 and 63 evenly.
1, 3, 7, 9, 21, 27, 63, 189.
It is any members of the infinite set of numbers of the form 63*k where k is an integer. Since the set is infinite, it is not possible to list them.
63 can be evenly divided by 1,3.7,9,21, and 63.