864566 has 8 divisors (see below), whose sum is σ = 1302480. Its totient is φ = 430408.

The previous prime is 864551. The next prime is 864581. The reversal of 864566 is 665468.

864566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (864551) and next prime (864581).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266 + ... + 1341.

It is an arithmetic number, because the mean of its divisors is an integer number (162810).

2⁸⁶⁴⁵⁶⁶ is an apocalyptic number.

864566 is a deficient number, since it is larger than the sum of its proper divisors (437914).

864566 is a wasteful number, since it uses less digits than its factorization.

864566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878.

The product of its digits is 34560, while the sum is 35.

The square root of 864566 is about 929.8204127680. The cubic root of 864566 is about 95.2648564716.

The spelling of 864566 in words is "eight hundred sixty-four thousand, five hundred sixty-six".