685978879586 has 64 divisors (see below), whose sum is σ = 1381738659840. Its totient is φ = 246672336960.

The previous prime is 685978879561. The next prime is 685978879601.

It is a happy number.

685978879586 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 685978879498 and 685978879507.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18477935 + ... + 18515021.

It is an arithmetic number, because the mean of its divisors is an integer number (21589666560).

Almost surely, 2^685978879586 is an apocalyptic number.

685978879586 is an abundant number, since it is smaller than the sum of its proper divisors (695759780254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685978879586 is a wasteful number, since it uses less digits than its factorization.

685978879586 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46359.

The product of its digits is 14631321600, while the sum is 86.

The spelling of 685978879586 in words is "six hundred eighty-five billion, nine hundred seventy-eight million, eight hundred seventy-nine thousand, five hundred eighty-six".