74 (number)
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74 is a natural number that follows 73 and precedes 75. It is an even number, meaning it can be divided by two without remainder.
In number theory, 74 is composed of two prime numbers multiplied together: 2 × 37. For this reason it belongs to the class of numbers known as semiprimes—numbers whose prime factors total exactly two when counted with multiplicity.
Mathematical properties
The divisors of 74 are 1, 2, 37, and 74. The sum of its proper divisors (those other than the number itself) is 1 + 2 + 37 = 40. Since 40 is less than 74, the number is classified as deficient—unlike perfect numbers such as 6 and 28.
74 can be expressed as a sum of two squares: 74 = 25 + 49, or 5² + 7². Numbers of this form are connected to Fermat's theorem on sums of two squares.
Notation and bases
In Roman numerals, 74 is written as LXXIV. In binary (base 2) it is 1001010, while in hexadecimal (base 16) it is 4A. In the standard decimal system, it consists of two digits: 7 in the tens place and 4 in the ones place.
Other uses
In chemistry, 74 is the atomic number of tungsten (also known as wolfram, with symbol W). The number is also used as a designation for years, road numbers, and administrative divisions in various countries.