868664 has 16 divisors (see below), whose sum is σ = 1699920. Its totient is φ = 415360.

The previous prime is 868663. The next prime is 868669. The reversal of 868664 is 466868.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868663) 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, 2177 + ... + 2544.

It is an arithmetic number, because the mean of its divisors is an integer number (106245).

2⁸⁶⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

868664 is a deficient number, since it is larger than the sum of its proper divisors (831256).

868664 is a wasteful number, since it uses less digits than its factorization.

868664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750 (or 4746 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 868664 is about 932.0214589804. The cubic root of 868664 is about 95.4151361814.

The spelling of 868664 in words is "eight hundred sixty-eight thousand, six hundred sixty-four".