Which of the following is completely divisible by 45?

A number that can be divisible by 3, 5, and 9 is also divisible by 45. So, we check the divisibility of given numbers by the following rules - A number is divisible by 3 if the sum of its entire digits is divisible by 3. The number which ends with 0 or 5 is divisible by 5. A number is divisible by 9 if the sum of its entire digits is divisible by 9. The number 306990 fulfills all the requirements, so the answer is 306990.