# Function factorial Compute the factorial of a value Factorial only supports an integer value as argument. For matrices, the function is evaluated element wise. ## Syntax ```js math.factorial(n) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `n` | number | BigNumber | Array | Matrix | An integer number ### Returns Type | Description ---- | ----------- number | BigNumber | Array | Matrix | The factorial of `n` ## Examples ```js math.factorial(5) // returns 120 math.factorial(3) // returns 6 ``` ## See also [combinations](combinations.md), [combinationsWithRep](combinationsWithRep.md), [gamma](gamma.md), [permutations](permutations.md)