864644371 has 4 divisors (see below), whose sum is σ = 865477600. Its totient is φ = 863811144.

The previous prime is 864644329. The next prime is 864644393. The reversal of 864644371 is 173446468.

864644371 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 864644371 - 2⁷ = 864644243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864644071) 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, 415056 + ... + 417133.

It is an arithmetic number, because the mean of its divisors is an integer number (216369400).

Almost surely, 2^864644371 is an apocalyptic number.

864644371 is a deficient number, since it is larger than the sum of its proper divisors (833229).

864644371 is a wasteful number, since it uses less digits than its factorization.

864644371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 833228.

The product of its digits is 387072, while the sum is 43.

The square root of 864644371 is about 29404.8358437860. The cubic root of 864644371 is about 952.6773490101.

The spelling of 864644371 in words is "eight hundred sixty-four million, six hundred forty-four thousand, three hundred seventy-one".