All multiples of 9 have a final digital sum of 9 as for example 9 times 55 = 495 and 4+9+5 = 18 and 1+8 = 9
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Nine
Multiples of 18.
Any multiple of 405.
The total sum of the digits has to equal nine.
there are too many! like 9, 18, 27, 36,...basially, all the multiples of nine are also multiples of 3.