685784886 has 12 divisors (see below), whose sum is σ = 1371698076. Its totient is φ = 228573580.

The previous prime is 685784881. The next prime is 685784893. The reversal of 685784886 is 688487586.

685784886 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685784881) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 58801 + ... + 69491.

It is an arithmetic number, because the mean of its divisors is an integer number (114308173).

Almost surely, 2^685784886 is an apocalyptic number.

685784886 is an abundant number, since it is smaller than the sum of its proper divisors (685913190).

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

685784886 is an frugal number, since it uses more digits than its factorization.

685784886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21387 (or 10696 counting only the distinct ones).

The product of its digits is 20643840, while the sum is 60.

The square root of 685784886 is about 26187.4948400950. The cubic root of 685784886 is about 881.8525393513.

The spelling of 685784886 in words is "six hundred eighty-five million, seven hundred eighty-four thousand, eight hundred eighty-six".