Factorial Calculator

Whole number for factorial, double factorial and subfactorial; any non-integer is allowed for the gamma function.
Result
3,628,800
Factorial Calculator
Exact value
3628800
Number of digits
7
log10 of the result
6.559763
Natural log of the result
15.104413
Scientific notation
3.628800 x 10^6
Expanded product
10! = 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1
Trailing zeros
2
Notation
10!
Worked out from NIST Digital Library of Mathematical Functions, 5.2 Gamma Function Definitions and 5.4 Special Values and 2 other sources.

How this is worked out

2 steps
  1. 10! multiplies every whole number from 10 down to 1.
  2. Trailing zeros come from factors of 10 = 2 x 5, and fives are scarcer: floor(10/5) + floor(10/25) + ... = 2.

Results are general information, not financial, tax, legal, medical or engineering advice.