686265618 has 16 divisors (see below), whose sum is σ = 1378424736. Its totient is φ = 227772960.

The previous prime is 686265607. The next prime is 686265649. The reversal of 686265618 is 816562686.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244048 + ... + 246843.

It is an arithmetic number, because the mean of its divisors is an integer number (86151546).

Almost surely, 2^686265618 is an apocalyptic number.

686265618 is an abundant number, since it is smaller than the sum of its proper divisors (692159118).

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

686265618 is a wasteful number, since it uses less digits than its factorization.

686265618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491129.

The product of its digits is 829440, while the sum is 48.

The square root of 686265618 is about 26196.6718878563. The cubic root of 686265618 is about 882.0585493910.

The spelling of 686265618 in words is "six hundred eighty-six million, two hundred sixty-five thousand, six hundred eighteen".