685978852 has 12 divisors (see below), whose sum is σ = 1292806396. Its totient is φ = 316605600.

The previous prime is 685978837. The next prime is 685978861. The reversal of 685978852 is 258879586.

It can be written as a sum of positive squares in 2 ways, for example, as 90326016 + 595652836 = 9504^2 + 24406^2 .

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, 6595899 + ... + 6596002.

Almost surely, 2^685978852 is an apocalyptic number.

It is an amenable number.

685978852 is a deficient number, since it is larger than the sum of its proper divisors (606827544).

685978852 is a wasteful number, since it uses less digits than its factorization.

685978852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13191918 (or 13191916 counting only the distinct ones).

The product of its digits is 9676800, while the sum is 58.

The square root of 685978852 is about 26191.1979871101. The cubic root of 685978852 is about 881.9356719726.

The spelling of 685978852 in words is "six hundred eighty-five million, nine hundred seventy-eight thousand, eight hundred fifty-two".