A nine-digit number can be anything between 100,000,000 and 999,999,999.
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If the sum of the digits of a number is a multiple of 9, the number is a multiple of 9.
9
easy.... 59
36
Yes it is... If you add the digits of ANY number together - and the result can be divided exactly by 3 or 9 - then the original number will also divide by 3 or 9. Since the digits of this number add together to make 18 - then 32643 will also divide by 3 or 9.