5×102

5×102 is an arithmetic expression representing the product of 5 and 102. Evaluated, it equals 510.

As an integer, 510 is even and composite. Its prime factorization is 2 × 3 × 5 × 17. Because it is divisible by 2, 3, and 5, it is divisible by 10 and by 30 as well; the sum of its decimal digits is 6, so it is also a Harshad number (510 ÷ 6 = 85). The number is not a perfect square, not a perfect cube, and not a prime. In Roman numerals it is written as DX.

In positional notation, 510 is 111111110 in binary and 1FE in hexadecimal. It appears in simple arithmetic and practical counting contexts as the result of scaling 102 by a factor of 5, for example converting quantities or prices when five units of a 102-value item are involved. As a product, 5×102 illustrates basic properties of multiplication such as commutativity (102×5 = 5×102) and distributivity over addition (5×(100+2) = 5×100 + 5×2).

The expression is commonly used in elementary mathematics as a straightforward example of multiplication and factorization.