The obvious answer is 3628800 which is 10 factorial.
The smallest such number is 2520 = 2*2*2*3*3*5*7
The smallest such number is 2520 = 2*2*2*3*3*5*7
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Lets see... It'd have to be an even number to be divisible by two. And it would have to end in 5 or 0 to be divisible by 5, but lets just say it must end with zero because at the same time you want it divisible by 2. So, there are two clues for you.
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362880
i did 1x2x3x4x5x6x7x8x9.....
=)
i did 1x2x3x4x5x6x7x8x9.....
=)