686309328 has 80 divisors (see below), whose sum is σ = 2055642240. Its totient is φ = 218820096.

The previous prime is 686309311. The next prime is 686309339. The reversal of 686309328 is 823903686.

686309328 is a `hidden beast` number, since 6 + 8 + 630 + 9 + 3 + 2 + 8 = 666.

686309328 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 an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24601 + ... + 44472.

It is an arithmetic number, because the mean of its divisors is an integer number (25695528).

Almost surely, 2^686309328 is an apocalyptic number.

It is an amenable number.

686309328 is an abundant number, since it is smaller than the sum of its proper divisors (1369332912).

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

686309328 is a wasteful number, since it uses less digits than its factorization.

686309328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69113 (or 69101 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 686309328 is about 26197.5061408524. The cubic root of 686309328 is about 882.0772758431.

The spelling of 686309328 in words is "six hundred eighty-six million, three hundred nine thousand, three hundred twenty-eight".