879639685 has 4 divisors (see below), whose sum is σ = 1055567628. Its totient is φ = 703711744.

The previous prime is 879639679. The next prime is 879639731. The reversal of 879639685 is 586936978.

879639685 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 can be written as a sum of positive squares in 2 ways, for example, as 280663009 + 598976676 = 16753^2 + 24474^2 .

It is a cyclic number.

It is not a de Polignac number, because 879639685 - 2⁷ = 879639557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87963964 + ... + 87963973.

It is an arithmetic number, because the mean of its divisors is an integer number (263891907).

Almost surely, 2^879639685 is an apocalyptic number.

It is an amenable number.

879639685 is a deficient number, since it is larger than the sum of its proper divisors (175927943).

879639685 is a wasteful number, since it uses less digits than its factorization.

879639685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175927942.

The product of its digits is 19595520, while the sum is 61.

The square root of 879639685 is about 29658.7202185125. The cubic root of 879639685 is about 958.1531641303.

The spelling of 879639685 in words is "eight hundred seventy-nine million, six hundred thirty-nine thousand, six hundred eighty-five".