SOLUTION: How do you answer 26! It seems the bigger the number we get a scientific notation. What is an easy way to answer n! if n is a big number?

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Question 404417: How do you answer 26! It seems the bigger the number we get a scientific notation. What is an easy way to answer n! if n is a big number?
Found 2 solutions by robertb, richard1234:
Answer by robertb(5830) About Me  (Show Source):
You can put this solution on YOUR website!
Stirling's approximation gives n! ~sqrt%282pi%2An%29%2A%28n%2Fe%29%5En.
My calculator gives sqrt%2852pi%29%2A%2826%2Fe%29%5E26 as 4.020009931%2A10%5E26, while 26! is 4.032914611%2A10%5E26.

Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
You could use Stirling's approximation, as the other tutor did. My TI-NSpire calculator can handle factorials up to roughly 450!.

26! is about 4.032914611*10^26