1,5,7,and 45
45
90
135
180
225
270
315
360
405
450
495
540
585
630
675
720
764
810
The above answer is wrong. Those are factors.
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Factors: 1, 3, 5, 9, 15, 45 Multiples: 45, 90, 135, 180, 225...
It is: 5*9 = 45
Itself and any of its multiples
They are all multiples of 9. Their common multiples are 405, 810, 1215 and so on.
9, 18, 27, 36, 45.