What is 87 factorial ?

Steps to calculate factorial of 87

How to calculate the factorial of 87

To find 87 factorial, or 87!, simply use the formula that multiplies the number 87 by all positive whole numbers less than it.

Let's look at how to calculate the Factorial of Eighty-seven :

87! is exactly : 2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000

Factorial of 87 can be calculated as:
87! = 87 x 86 x 85 x 84 x ... x 3 x 2 x 1

The number of trailing zeros in 87! is 20

The number of digits in 87 factorial is 133.

What Is Factorial?

A factorial is represented by an integer and an exclamation mark. In Mathematics, factorial is a multiplication process of natural numbers .

It multiplies the number by every natural number that is less than it .

Symbolically, it is symbolized as "!".

The function is used, among other things, to find the "n" way objects can be structured .

Factorial Formula

To find the factorial of any given number, replace the value for n in the given equation :

n! = n × (n-1) × (n-2) × (n-3) × ….× 3 × 2 × 1

The expansion of the formula provides numbers to be multiplied together with each other to receive the factorial of the number.

We can also figure out a factorial from the prior one. The factorial of any number is that number times the factorial of (that number minus 1).

So the rule is : n! = n × (n−1)!

Example :
87! Factorial = 87 x 86 x 85 x 84 x ... x 3 x 2 x 1 = 87 × 86! = 2107757298379527717213600518699389595229783738061356212322972511214654115727593174080683423236414793504734471782400000000000000000000

What are Factorials Used For?

The best use of factorial is in Combinations and Permutations.

Example : Determine how to arrange letters without repeating?

There one way for 1 letter "a":
2 ways for two letters "ab": ab, ba.
There are 6 ways for 3 letters "abc": abc acb cab bac bca.
There are 24 ways for 1234 of the letters "abcd"