866604 has 24 divisors (see below), whose sum is σ = 2037168. Its totient is φ = 286720.

The previous prime is 866581. The next prime is 866623. The reversal of 866604 is 406668.

It is a happy number.

866604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 13.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2944 + ... + 3224.

It is an arithmetic number, because the mean of its divisors is an integer number (84882).

2⁸⁶⁶⁶⁰⁴ is an apocalyptic number.

It is an amenable number.

866604 is an abundant number, since it is smaller than the sum of its proper divisors (1170564).

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

866604 is a wasteful number, since it uses less digits than its factorization.

866604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 866604 is about 930.9156782437. The cubic root of 866604 is about 95.3396521586.

The spelling of 866604 in words is "eight hundred sixty-six thousand, six hundred four".