864775 has 6 divisors (see below), whose sum is σ = 1072352. Its totient is φ = 691800.

The previous prime is 864757. The next prime is 864781. The reversal of 864775 is 577468.

It is a happy number.

It is not a de Polignac number, because 864775 - 2¹¹ = 862727 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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, 17271 + ... + 17320.

2⁸⁶⁴⁷⁷⁵ is an apocalyptic number.

864775 is a deficient number, since it is larger than the sum of its proper divisors (207577).

864775 is a wasteful number, since it uses less digits than its factorization.

864775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34601 (or 34596 counting only the distinct ones).

The product of its digits is 47040, while the sum is 37.

The square root of 864775 is about 929.9327932706. The cubic root of 864775 is about 95.2725322885.

The spelling of 864775 in words is "eight hundred sixty-four thousand, seven hundred seventy-five".