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8 (eight) is a positive integer following 7 and preceding 9. Its ordinal form is written "8th" or "eighth".

## Properties

8 is an even number.
• 8 is the 2nd cube number.
• 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 octi-.
• 8 is equal to $$f_2(2)$$ or $$f_\omega(2)$$ in the fast-growing hierarchy.