168904 has 16 divisors (see below), whose sum is σ = 324720. Its totient is φ = 82320.

The previous prime is 168901. The next prime is 168913. The reversal of 168904 is 409861.

It is a super-2 number, since 2×168904² = 57057122432, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (168901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99 + ... + 589.

It is an arithmetic number, because the mean of its divisors is an integer number (20295).

2¹⁶⁸⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

168904 is a deficient number, since it is larger than the sum of its proper divisors (155816).

168904 is a wasteful number, since it uses less digits than its factorization.

168904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 168904 is about 410.9793182144. The cubic root of 168904 is about 55.2772774679.

The spelling of 168904 in words is "one hundred sixty-eight thousand, nine hundred four".