DreamTheaterForums.org Dream Theater Fan Site

General => General Discussion => Topic started by: IDontNotDoThings on December 19, 2017, 04:23:06 AM

Title: One million factorial? (Easiest way to find)
Post by: IDontNotDoThings on December 19, 2017, 04:23:06 AM

So, I'm trying to find a way to calculate one million factorial in the simplest way I can understand. For those who don't know, a million factorial (or 1,000,000!) = 1,000,000 * 999,999 * 999,998 * 999,997 * etc. I know how to find the sum (which is 500,000,500,000 using arithmetic series), but not the product. Is there a way to figure it out without having to run it in a coding language? Thanks in advance.

(& believe it or not this isn't for school I just actually wanted to know)  :justjen

Title: Re: One million factorial? (Easiest way to find)
Post by: Implode on December 19, 2017, 08:50:19 AM

I found this! (https://math.stackexchange.com/questions/454689/why-is-there-no-explicit-formula-for-the-factorial)

(https://imgur.com/19jYQyG.png)

Title: Re: One million factorial? (Easiest way to find)
Post by: Logain Ablar on December 19, 2017, 09:02:33 AM

https://www.wolframalpha.com/input/?i=What+is+one+million+factorial%3F

8.2639316883312400623766461031726662911353479789638 × 10^5565708

(apparently  :))