864684 has 18 divisors (see below), whose sum is σ = 2185820. Its totient is φ = 288216.

The previous prime is 864679. The next prime is 864691. The reversal of 864684 is 486468.

864684 is a `hidden beast` number, since 8 + 646 + 8 + 4 = 666.

864684 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 24019 = 864684 / (8 + 6 + 4 + 6 + 8 + 4).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 864684.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11974 + ... + 12045.

2⁸⁶⁴⁶⁸⁴ is an apocalyptic number.

It is an amenable number.

864684 is an abundant number, since it is smaller than the sum of its proper divisors (1321136).

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

864684 is a wasteful number, since it uses less digits than its factorization.

864684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24029 (or 24024 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 864684 is about 929.8838637163. The cubic root of 864684 is about 95.2691903385.

The spelling of 864684 in words is "eight hundred sixty-four thousand, six hundred eighty-four".