685684668 has 24 divisors (see below), whose sum is σ = 1603284480. Its totient is φ = 228082480.

The previous prime is 685684667. The next prime is 685684669. The reversal of 685684668 is 866486586.

It is an interprime number because it is at equal distance from previous prime (685684667) and next prime (685684669).

It is a super-5 number, since 5×685684668⁵ (a number of 45 digits) contains 55555 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685684661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53898 + ... + 65393.

It is an arithmetic number, because the mean of its divisors is an integer number (66803520).

Almost surely, 2^685684668 is an apocalyptic number.

It is an amenable number.

685684668 is an abundant number, since it is smaller than the sum of its proper divisors (917599812).

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

685684668 is a wasteful number, since it uses less digits than its factorization.

685684668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119777 (or 119775 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 57.

The square root of 685684668 is about 26185.5812996389. The cubic root of 685684668 is about 881.8095803977.

The spelling of 685684668 in words is "six hundred eighty-five million, six hundred eighty-four thousand, six hundred sixty-eight".