864910865 has 16 divisors (see below), whose sum is σ = 1277407488. Its totient is φ = 547459776.

The previous prime is 864910861. The next prime is 864910931. The reversal of 864910865 is 568019468.

It is a cyclic number.

It is not a de Polignac number, because 864910865 - 2² = 864910861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864910861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 949997 + ... + 950906.

It is an arithmetic number, because the mean of its divisors is an integer number (79837968).

Almost surely, 2^864910865 is an apocalyptic number.

It is an amenable number.

864910865 is a deficient number, since it is larger than the sum of its proper divisors (412496623).

864910865 is a wasteful number, since it uses less digits than its factorization.

864910865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1900928.

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 864910865 is about 29409.3669602050. The cubic root of 864910865 is about 952.7752145708.

The spelling of 864910865 in words is "eight hundred sixty-four million, nine hundred ten thousand, eight hundred sixty-five".