The exact factorial of 90 is:

1485715964481761497309522733620825737885569961284688766942216863704985393094065876545992131370884059645617234469978112000000000000000000000

📌 Number of digits in the exact factorial of 90! = 139.

Approximately, the value of 90! can also be written as 1.485715964 E+138.

## How to calculate 90!

The formula for finding the factorial of a number is:

n! = n × (n-1) × (n-2) × … × 2 × 1

The same formula can also be written in terms of PI product notation as: So, by definition, 90! is calculated as:

90 × 89 × 88 × … × 2 × 1

Also see:

### How many digits are there in the exact value of 90!?

There are 139 digits in the exact value of 90!.

### What is the value of 90 factorial in terms of E?

The value of 90! in terms of E is 1.485715964 E+138.

### What are the uses of factorials?

According to Wikipedia:

In mathematical analysis, factorials are used in power series for the exponential function and other functions, and they also have applications in algebra, number theory, probability theory, and computer science.