Main Page | See live article | Alphabetical index Twenty-seven (27) is the natural number following twenty-six and preceding twenty-eight. Twenty-seven is a perfect cube, being 33 = 3 × 3 × 3. It is the magic result of a prime reciprocal magic square of the multiples of 1/7. A 10,000-day-old person is 27 years old (and some months). Twenty-seven is also: The atomic number of cobalt. The total number of books in the New Testament of the Holy Bible. The number of letters in the Spanish alphabet The current number of Amendments to the United States Constitution. The age in years at which rock music stars Jim Morrison, Jimi Hendrix and Kurt Cobain died. The code for international direct-dialed phone calls to South Africa. See also: twenty-five, twenty-six, twenty-eight, twenty-nine, integer, list of numbers. This article is about the number. For the year A.D. 27, see 27. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.