8×109

8×109 is an arithmetic expression that denotes the product of the integers 8 and 109. In this notation, the multiplication sign × indicates multiplication. Evaluating the expression gives 872.

Prime factorization: 872 = 2^3 × 109. The factor 109 is a prime number, so this is the prime factorization of 872.

Context and comparisons: 109 is prime, with no divisors other than 1 and 109. This example illustrates how a composite number can be factored into primes. The notation 8×109 should not be confused with 8×10^9 (eight billion), which is vastly larger and used in scientific contexts to express large quantities.

Usage: Such expressions appear in elementary arithmetic, algebraic exercises, and as examples for factoring integers or for practicing multiplication.