# Python | math.factorial() function

In Python, math module contains a number of mathematical operations, which can be performed with ease using the module. `math.factorial()` function returns the factorial of desired number.

```Syntax: math.factorial(x)

Parameter:
x: This is a numeric expression.

Returns:  factorial of desired number.```

Code #1:

 `# Python code to demonstrate the working of factorial() ` `   `  `# importing "math" for mathematical operations  ` `import` `math  ` `   `  `x ``=` `5` `   `  `# returning the factorial ` `print` `(``"The factorial of 5 is : "``, end ``=``"")  ` `print` `(math.factorial(x)) `

Output:

```The factorial of 5 is : 120
```

Code #2:

 `# Python code to demonstrate the working of factorial() ` ` `  `# importing "math" for mathematical operations  ` `import` `math  ` ` `  `x ``=` `5` `y ``=` `15` `z ``=` `8` ` `  `# returning the factorial ` `print` `(``"The factorial of 5 is : "``, math.factorial(x)) ` `print` `(``"The factorial of 15 is : "``, math.factorial(y)) ` `print` `(``"The factorial of 8 is : "``, math.factorial(z)) `

Output:

```The factorial of 5 is :  120
The factorial of 15 is :  1307674368000
The factorial of 8 is :  40320```

Code #3: Throws ValueError if x is not integer

 `# Python code to demonstrate the working of factorial() ` `   `  `# importing "math" for mathematical operations  ` `import` `math  ` `   `  `# when x is not integer ` `print` `(``"math.factorial(13.7) : "``, math.factorial(``13.7``)) `

Output:

`ValueError: factorial() only accepts integral values`

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