268

268 is a natural number that follows 267 and precedes 269. It is even and composite.

In mathematics, 268 = 2^2 × 67. Its divisors are 1, 2, 4, 67, 134, and 268. The sum of its proper divisors is 208, so 268 is a deficient number. Euler's totient function gives φ(268) = 132.

In numeral systems, 268 is written as 100001100 in binary, 0x10C in hexadecimal, and 100221_3 in base-3. In Roman numerals it is CCLXVIII.

Calendrically, the 268th day of a common year is September 25; in a leap year, September 24.

In telecommunications, 268 is the calling code associated with Antigua and Barbuda under the North American Numbering Plan, written as +1-268.

Historically, 268 CE was a year of the Roman Empire during the Crisis of the Third Century, with Claudius II Gothicus ascending to the throne and ongoing campaigns against the Goths.