**9000**= 2 x 2 x 2 x 3 x 3 x 5 x 5 x 5.

**9000**has two representations as a sum of two squares:

**9000**= 30

^{2}+ 90

^{2}= 54

^{2}+ 78

^{2}.

**9000**is the index of a triangular number containing only three different digits.

**9000**is a centered cube number.

**9000**is the number of palindromes of length 8 (A050683).

The BFG-

**9000**is the most powerful weapon in the video game series

*Doom*.

Source: What's Special About This Number?