685866644 has 12 divisors (see below), whose sum is σ = 1201540704. Its totient is φ = 342569304.

The previous prime is 685866611. The next prime is 685866707. The reversal of 685866644 is 446668586.

It is a happy number.

685866644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 86744 + ... + 94319.

It is an arithmetic number, because the mean of its divisors is an integer number (100128392).

Almost surely, 2^685866644 is an apocalyptic number.

It is an amenable number.

685866644 is a deficient number, since it is larger than the sum of its proper divisors (515674060).

685866644 is a wasteful number, since it uses less digits than its factorization.

685866644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182014 (or 182012 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 53.

The square root of 685866644 is about 26189.0558058132. The cubic root of 685866644 is about 881.8875822325.

The spelling of 685866644 in words is "six hundred eighty-five million, eight hundred sixty-six thousand, six hundred forty-four".