864475813 has 4 divisors (see below), whose sum is σ = 909974560. Its totient is φ = 818977068.

The previous prime is 864475771. The next prime is 864475817. The reversal of 864475813 is 318574468.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 864475813 - 2⁹ = 864475301 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864475817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22749345 + ... + 22749382.

It is an arithmetic number, because the mean of its divisors is an integer number (227493640).

Almost surely, 2^864475813 is an apocalyptic number.

It is an amenable number.

864475813 is a deficient number, since it is larger than the sum of its proper divisors (45498747).

864475813 is a wasteful number, since it uses less digits than its factorization.

864475813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45498746.

The product of its digits is 645120, while the sum is 46.

The square root of 864475813 is about 29401.9695428725. The cubic root of 864475813 is about 952.6154384605.

The spelling of 864475813 in words is "eight hundred sixty-four million, four hundred seventy-five thousand, eight hundred thirteen".