help, Find the number of positive divisors of 9!.

Prime factor 9!:

 

3^2 x 2^3 x 7 x 2 x 3 x 5 x 2^2 x 3 x 2 = 2^7 x 3^4 x 5 x 7

 

So, the number of factors is 8 x 5 x 2 x 2 = 160.