8

8 (eight) is a positive integer following 7 and preceding 9. Its ordinal form is written "8th" or "eighth".
== Properties ==
*8 is an .
*8 is the 2nd .
*8 is equal to 4!!, the double factorial of 4.
*8 is a power of two.
*8 is the only number whose square is two digits, both of which are even.
== In googology ==
*Some googologisms based on 8 are superoct and octoogol.
*In Greek- and Latin-based number naming systems, 8 is associated with prefix octa- or octo-.
*8 is equal to \(f_2(2)\) or \(f_\omega(2)\) in the fast-growing hierarchy.
*Aarex Tiaokhiao coined the name octal-uoonol for this number.Part 1 (LAN) - Aarex Googology
*Username5243 coined the names Binary-Gootol and Octal-Goonol for this number, and it's equal to 2[1]3 = 8[1]1 in Username5243's Array Notation.Part 1 - My Large Numbers
*HaydenTheGoogologist2009 coined I needed this! for this number, and it's the 2nd number in Meet yourself in 105 degrees Celsius.Hayden's Big Numbers - Meet yourself in 105 degrees Celsius. Retrieved 2023-01-13.
== Sources ==
cs:8
es:8
Category:Numbers
Category:Numbers 0-99
Category:Class 1
Category:Fibonacci numbers
Category:Numbers with 1 to 2 digits
Category:Powers of 2
Category:Googol Regiment
Category:Doogol Regiment