The factorial of a number is the product of all the integers from 1 to that number.

For example, the factorial of 6 is `1*2*3*4*5*6 = 720`

. Factorial is not defined for negative numbers and the factorial of zero is one, 0! = 1.

## Source Code

```
# Factorial of a number using recursion
def recur_factorial(n):
if n == 1:
return n
else:
return n*recur_factorial(n-1)
num = 7
# check if the number is negative
if num < 0:
print("Sorry, factorial does not exist for negative numbers")
elif num == 0:
print("The factorial of 0 is 1")
else:
print("The factorial of", num, "is", recur_factorial(num))
```

**Output**

The factorial of 7 is 5040

**Note:** To find the factorial of another number, change the value of `num`

.

Here, the number is stored in `num`

. The number is passed to the `recur_factorial()`

function to compute the factorial of the number.