Factorial/Examples/1000

Example of Factorial
The factorial of $1\,000$ starts:
 * $402,387,260,077,093,773,543,702,433,923,003,985,719,374,864, \ldots$

and has $2568$ digits, of which the last $249$ are $0$.

Proof
From Stirling's Formula:
 * $n! \sim \sqrt {2 \pi n} \left({\dfrac n e}\right)^n$