866808 has 32 divisors (see below), whose sum is σ = 2408400. Its totient is φ = 288864.

The previous prime is 866783. The next prime is 866819. The reversal of 866808 is 808668.

It is a super-2 number, since 2×866808² = 1502712217728, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an Ulam number.

It is a congruent number.

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, 1791 + ... + 2222.

2⁸⁶⁶⁸⁰⁸ is an apocalyptic number.

It is an amenable number.

866808 is an abundant number, since it is smaller than the sum of its proper divisors (1541592).

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

866808 is a wasteful number, since it uses less digits than its factorization.

866808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4028 (or 4018 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 866808 is about 931.0252413334. The cubic root of 866808 is about 95.3471326084.

The spelling of 866808 in words is "eight hundred sixty-six thousand, eight hundred eight".