686390608 has 20 divisors (see below), whose sum is σ = 1331168148. Its totient is φ = 342863360.

The previous prime is 686390597. The next prime is 686390629. The reversal of 686390608 is 806093686.

It is a happy number.

686390608 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 263347984 + 423042624 = 16228^2 + 20568^2 .

It is a super-2 number, since 2×686390608² = 942264133501219328, 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 3 ways as a sum of consecutive naturals, for example, 3241 + ... + 37192.

Almost surely, 2^686390608 is an apocalyptic number.

It is an amenable number.

686390608 is a deficient number, since it is larger than the sum of its proper divisors (644777540).

686390608 is a wasteful number, since it uses less digits than its factorization.

686390608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41502 (or 41496 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 686390608 is about 26199.0573876237. The cubic root of 686390608 is about 882.1120961046.

The spelling of 686390608 in words is "six hundred eighty-six million, three hundred ninety thousand, six hundred eight".