One hundred [and] eight (or nine dozen) is an abundant number and a semiperfect number. It is a tetranacci number.
It is the hyperfactorial of 3 since it is of the form .
108 is a number that 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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