540

540 is a natural number that follows 539 and precedes 541. In prime factorization, it equals 2^2 × 3^3 × 5. It is an even, composite number with 24 positive divisors. The sum of all divisors is 1680, so the sum of its proper divisors is 1140, making 540 an abundant number. It is also a Harshad number in base 10, since the digit sum 5+4+0 = 9 divides 540 (540 = 9 × 60).

In numeral systems, 540 in binary is 1000011100, and in Roman numerals it is DXL. Geometrically, 540 degrees is the sum of the interior angles of a pentagon, since (5−2) × 180 = 540.

In practical terms, 540 minutes equal 9 hours. The term 540p is used in video standards to denote a vertical resolution of about 540 lines, typically appearing in contexts such as streaming or displays.

540 also serves as an area code in the United States, used for telephone numbers in parts of Virginia. The number appears in various cataloging and numbering contexts, including measurements, identifiers, and historical dating, where it functions as a simple, well-defined integer.