166907904 has 156 divisors (see below), whose sum is σ = 482810304. Its totient is φ = 51249152.

The previous prime is 166907903. The next prime is 166907911. The reversal of 166907904 is 409709661.

166907904 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166907903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3551209 + ... + 3551255.

Almost surely, 2^166907904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 166907904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (241405152).

166907904 is an abundant number, since it is smaller than the sum of its proper divisors (315902400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166907904 is an equidigital number, since it uses as much as digits as its factorization.

166907904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 166907904 is about 12919.2841906973. The cubic root of 166907904 is about 550.5865961887.

The spelling of 166907904 in words is "one hundred sixty-six million, nine hundred seven thousand, nine hundred four".