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108 (number) : ウィキペディア英語版 | 108 (number)
108 (one hundred () eight) is the natural number following 107 and preceding 109. == In mathematics ==
108 (or nine dozen) is an abundant number and a semiperfect number. It is a tetranacci number. 108 is the hyperfactorial of 3 since it is of the form . 108 is divisible by the value of its φ function, which is 36. 108 is also divisible by the total number of its divisors (12), hence it is a refactorable number. In Euclidean space, the interior angles of a regular pentagon measure 108 degrees each. There are 108 free polyominoes of order 7. In base 10, it is a Harshad number and a self number. The equation results in the golden ratio.
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