Twentyseven

Twenty-seven (27) is a natural number that follows twenty-six and precedes twenty-eight. It is the cube of 3, a perfect cube.

In decimal mathematics, 27 is divisible by the sum of its digits (2 + 7 = 9), making it a Harshad (or Niven) number.

In various numeral systems, 27 is represented as 11011 in binary, 1000 in base-3, and 30 in base-9. In Roman numerals it is XXVII.

In science, cobalt, with the chemical symbol Co, has atomic number 27. Cobalt is used in steel alloys and blue pigments.

Culturally, the term the 27 Club refers to a group of famous musicians who died at age 27, including Jimi Hendrix, Janis Joplin, Jim Morrison, Kurt Cobain, and Amy Winehouse.

The Moon’s sidereal orbital period is about 27.3 days, a figure often cited in discussions of the lunar cycle.

In computing, the decimal value 27 corresponds to the Escape (ESC) control character in ASCII.