685640875 has 16 divisors (see below), whose sum is σ = 856586016. Its totient is φ = 547932000.

The previous prime is 685640867. The next prime is 685640927. The reversal of 685640875 is 578046586.

685640875 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 685640875 - 2³ = 685640867 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146065 + ... + 150685.

It is an arithmetic number, because the mean of its divisors is an integer number (53536626).

Almost surely, 2^685640875 is an apocalyptic number.

685640875 is a deficient number, since it is larger than the sum of its proper divisors (170945141).

685640875 is a wasteful number, since it uses less digits than its factorization.

685640875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5823 (or 5813 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 49.

The square root of 685640875 is about 26184.7450818220. The cubic root of 685640875 is about 881.7908069921.

The spelling of 685640875 in words is "six hundred eighty-five million, six hundred forty thousand, eight hundred seventy-five".