74

74 is a natural number that comes after 73 and before 75. It is even and composite, with prime factorization 2 × 37. Its divisors are 1, 2, 37, and 74, and the sum of its proper divisors is 40, making 74 a deficient number. In various numeral systems, 74 is written as 1001010 in binary, 112 in octal, and 4A in hexadecimal. In Roman numerals it is LXXIV, and in ASCII encoding the decimal value 74 corresponds to the uppercase letter J.

74 is also the atomic number of tungsten, a very dense metal with a high melting point. Tungsten has practical applications in electrical filaments, cutting tools, and hard alloys. The name tungsten derives from Swedish tung sten, meaning heavy stone, while the symbol W reflects its traditional German name Wolfram.

As a semiprime, 74 has exactly four positive divisors: 1, 2, 37, and 74. It is not a prime, a square, or a triangular number. The number appears in various mathematical contexts and is typically treated as a two-digit integer in calendars, codes, and numeration.

Historically, the notation 74 can denote a year in the Common Era or Before Common Era, depending on context, but no single global event defines the year 74.