500000000

500,000,000, written in words as five hundred million, is a natural number that follows 499,999,999 and precedes 500,000,001. In scientific notation it is 5 × 10^8. It is an even number and a multiple of 10, making it a round figure in decimal arithmetic.

Prime factorization and divisors: 500,000,000 can be expressed as 2^8 × 5^9. This shows it is divisible by powers of 2 and 5, and its total number of positive divisors is (8 + 1) × (9 + 1) = 90. Consequently, it is a composite number with a substantial set of factors.

Decimal and base representations: as a decimal, the number is written with eight trailing zeros, reflecting its origin as a product of powers of 2 and 5. In other base systems, its representation differs, but its factorization into 2^8 and 5^9 remains a key structural property in base-10 arithmetic.

Contexts and usage: 500,000,000 is commonly used as a rounding figure or benchmark in large-scale estimates, such as population counts, budgetary planning, or data-scale descriptions. It serves as a convenient halfway point between one hundred million and one billion and is often abbreviated as half a billion in informal contexts.

See also: 10^8, 10^9, million, billion.