A number is a multiple of 9 and a factor of 72. This number should be

Grasp the factor of 72
72=9*2*2*2
Don't use factorization here, otherwise we can't solve the problem
The answer is there
One is 9
One is 9 * 2 = 18
One is 9 * 2 * 2 = 36
One is 9 * 2 * 2 * 2 = 72

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