76 (number)
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76 is a natural number that comes after 75 and before 77. It is an even number and a composite number, meaning it has divisors other than 1 and itself.
In standard decimal notation, 76 is written with two digits: 7 and 6. In Roman numerals, it is written as LXXVI.
Mathematical properties
The prime factorization of 76 is 2 × 2 × 19, also written as 2² × 19. Its divisors are 1, 2, 4, 19, 38, and 76. The sum of its proper divisors is 64; therefore 76 is a deficient number, since 64 is less than 76.
76 is one of the automorphic numbers: its square is 5776, which ends in the digits 76. This property makes it one of the few two-digit numbers with this characteristic, with 25 and 76 being the only two-digit automorphic numbers.
76 is also part of the Lucas sequence, which begins 2, 1, 3, 4, 7, 11, 18, 29, 47, 76—where each number is the sum of the two preceding numbers.
General use
In chemistry, 76 is the atomic number of the element osmium, which is among the densest metals. 76 is also used in calendars, road numbers, and general enumeration in lists.