80 (number) Wikipedia. In mathematics 80 is: the sum of Euler's totient function φ ( x) over the first sixteen integers. a semiperfect number, since adding up some subsets of its divisors (e.g., 1, 4, 5, 10, 20 and 40) gives 80. [1] a ménage number. [2] palindromic in bases 3 (2222 3 ), 6 (212 6 ), 9 (88 9 ), 15 (55 15 ), 19 (44 19) and 39 (22 39 ).
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80 may refer to: 80 (number) one of the years 80 BC, AD 80, 1980, 2080 B. B. King & Friends: 80 80 (Tolis Voskopoulos album), 1980 Audi 80, a precursor of the Audi A4 automobile Boeing 80, a late 1920s Boeing aircraft "80", a song by Green Day from their 1991 album Kerplunk! See also [ edit] All pages with titles containing 80
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