500

500 = 2² x 5³.

500 has two representations as a sum of two squares: 500 = 4² + 22² = 10² + 20².

There are exactly 500 prime numbers between 20,000 and 25,000.

166,500,333 = 166³ + 500³ + 333³.

500 is 4000 in base 5. It is 13310 in base 3 and 1313 in base 7.

A ream contains 500 sheets of paper.

Source: Numeropedia