864390079 has 4 divisors (see below), whose sum is σ = 987874384. Its totient is φ = 740905776.

The previous prime is 864390077. The next prime is 864390089. The reversal of 864390079 is 970093468.

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 864390079 - 2¹ = 864390077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (864390073) 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, 61742142 + ... + 61742155.

It is an arithmetic number, because the mean of its divisors is an integer number (246968596).

Almost surely, 2^864390079 is an apocalyptic number.

864390079 is a deficient number, since it is larger than the sum of its proper divisors (123484305).

864390079 is a wasteful number, since it uses less digits than its factorization.

864390079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123484304.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 864390079 is about 29400.5115431688. The cubic root of 864390079 is about 952.5839456835.

The spelling of 864390079 in words is "eight hundred sixty-four million, three hundred ninety thousand, seventy-nine".