A number, which is divisible by 3, 5, and 9, is also divisible by 45.
A number is divisible by 3 if the sum of its entire digits is divisible by 3. A number is divisible by 9 if the sum of its entire digits is divisible by 9. The number which ends with 0 or 5 is divisible by 5.
The number 306990 fulfils all the requirements, so the answer is 306990.
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