1, 3 and 9.
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3 goes into 36 and 63 evenly.
1, 3, 7, 9, 21, 63
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.