686231730 has 32 divisors (see below), whose sum is σ = 1829952000. Its totient is φ = 182995056.

The previous prime is 686231729. The next prime is 686231737. The reversal of 686231730 is 37132686.

It is a happy number.

686231730 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (686231737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270530 + ... + 1271069.

It is an arithmetic number, because the mean of its divisors is an integer number (57186000).

Almost surely, 2^686231730 is an apocalyptic number.

686231730 is an abundant number, since it is smaller than the sum of its proper divisors (1143720270).

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

686231730 is a wasteful number, since it uses less digits than its factorization.

686231730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541615 (or 2541609 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 686231730 is about 26196.0250801529. The cubic root of 686231730 is about 882.0440303809.

The spelling of 686231730 in words is "six hundred eighty-six million, two hundred thirty-one thousand, seven hundred thirty".