686641830 has 32 divisors (see below), whose sum is σ = 1883361024. Its totient is φ = 156946656.

The previous prime is 686641811. The next prime is 686641841. The reversal of 686641830 is 38146686.

It is a happy number.

686641830 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1634652 + ... + 1635071.

It is an arithmetic number, because the mean of its divisors is an integer number (58855032).

Almost surely, 2^686641830 is an apocalyptic number.

686641830 is an abundant number, since it is smaller than the sum of its proper divisors (1196719194).

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

686641830 is a wasteful number, since it uses less digits than its factorization.

686641830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3269740.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 686641830 is about 26203.8514344743. The cubic root of 686641830 is about 882.2197019545.

The spelling of 686641830 in words is "six hundred eighty-six million, six hundred forty-one thousand, eight hundred thirty".