685824618 has 16 divisors (see below), whose sum is σ = 1374191136. Its totient is φ = 228184560.

The previous prime is 685824613. The next prime is 685824641. The reversal of 685824618 is 816428586.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (685824613) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102396 + ... + 108887.

It is an arithmetic number, because the mean of its divisors is an integer number (85886946).

Almost surely, 2^685824618 is an apocalyptic number.

685824618 is an abundant number, since it is smaller than the sum of its proper divisors (688366518).

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

685824618 is a wasteful number, since it uses less digits than its factorization.

685824618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211829.

The product of its digits is 737280, while the sum is 48.

The square root of 685824618 is about 26188.2534354622. The cubic root of 685824618 is about 881.8695695159.

The spelling of 685824618 in words is "six hundred eighty-five million, eight hundred twenty-four thousand, six hundred eighteen".