108 is: an abundant number. a semiperfect number. a tetranacci number. the hyperfactorial of 3 since it is of the form 1 1 ⋅ 2 2 ⋅ 3 3 {\displaystyle 1^{1}\cdot 2^{2}\cdot 3^{3}}. divisible by the value of its φ function, which is 36. divisible by the total number of its divisors (12), hence it is a refactorable number. the angle in degrees of the interior angles of a regular pentagon in Euclidean space. palindromic in bases 11 (9911), 17 (6617), 26 (4426), 35 (3335) and 53 (2253) a Harshad number in bases 2, 3, 4, 6, 7, 9, 10, 11, 12, 13 and 16 a self number. an Achilles number because it is a powerful number but not a perfect power. a largely composite number because its number of divisors is 12 and no smaller number has more than 12 divisors. nine dozen, or three quarters of a gross.
