88,400
0! has a solution - it comes up as 1.
You can work it out by taking the factorial of the next number then dividing by that number ie. n! = (n+1)!/(n+1)
If you take that approach, you'll eventually get to 0! which is 1!/1 = 1
...
I'm an engineering student. I understand if you wish to call me a nerd now.