686395220 has 24 divisors (see below), whose sum is σ = 1647348864. Its totient is φ = 235335456.

The previous prime is 686395207. The next prime is 686395243. The reversal of 686395220 is 22593686.

686395220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×686395220² = 942276796077696800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2451272 + ... + 2451551.

It is an arithmetic number, because the mean of its divisors is an integer number (68639536).

Almost surely, 2^686395220 is an apocalyptic number.

It is an amenable number.

686395220 is an abundant number, since it is smaller than the sum of its proper divisors (960953644).

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

686395220 is a wasteful number, since it uses less digits than its factorization.

686395220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4902839 (or 4902837 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 686395220 is about 26199.1454059097. The cubic root of 686395220 is about 882.1140717978.

The spelling of 686395220 in words is "six hundred eighty-six million, three hundred ninety-five thousand, two hundred twenty".