864875 has 32 divisors (see below), whose sum is σ = 1280448. Its totient is φ = 576000.

The previous prime is 864817. The next prime is 864883. The reversal of 864875 is 578468.

It is not a de Polignac number, because 864875 - 2⁶ = 864811 is a prime.

It is a Duffinian number.

Its product of digits (53760) is a multiple of the sum of its prime divisors (70).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23357 + ... + 23393.

It is an arithmetic number, because the mean of its divisors is an integer number (40014).

2⁸⁶⁴⁸⁷⁵ is an apocalyptic number.

864875 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

864875 is a deficient number, since it is larger than the sum of its proper divisors (415573).

864875 is a wasteful number, since it uses less digits than its factorization.

864875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 70 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 864875 is about 929.9865590427. The cubic root of 864875 is about 95.2762044907.

The spelling of 864875 in words is "eight hundred sixty-four thousand, eight hundred seventy-five".