864708865 has 4 divisors (see below), whose sum is σ = 1037650644. Its totient is φ = 691767088.

The previous prime is 864708821. The next prime is 864708869. The reversal of 864708865 is 568807468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 247086961 + 617621904 = 15719^2 + 24852^2 .

It is a cyclic number.

It is not a de Polignac number, because 864708865 - 2⁹ = 864708353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864708869) 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, 86470882 + ... + 86470891.

It is an arithmetic number, because the mean of its divisors is an integer number (259412661).

Almost surely, 2^864708865 is an apocalyptic number.

It is an amenable number.

864708865 is a deficient number, since it is larger than the sum of its proper divisors (172941779).

864708865 is a wasteful number, since it uses less digits than its factorization.

864708865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172941778.

The product of its (nonzero) digits is 2580480, while the sum is 52.

The square root of 864708865 is about 29405.9324796885. The cubic root of 864708865 is about 952.7010352204.

The spelling of 864708865 in words is "eight hundred sixty-four million, seven hundred eight thousand, eight hundred sixty-five".