686570656 has 48 divisors (see below), whose sum is σ = 1371591144. Its totient is φ = 338264064.

The previous prime is 686570587. The next prime is 686570663. The reversal of 686570656 is 656075686.

It can be written as a sum of positive squares in 4 ways, for example, as 610880656 + 75690000 = 24716^2 + 8700^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1157496 + ... + 1158088.

Almost surely, 2^686570656 is an apocalyptic number.

It is an amenable number.

686570656 is a deficient number, since it is larger than the sum of its proper divisors (685020488).

686570656 is a wasteful number, since it uses less digits than its factorization.

686570656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073 (or 1065 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 49.

The square root of 686570656 is about 26202.4933164766. The cubic root of 686570656 is about 882.1892186797.

The spelling of 686570656 in words is "six hundred eighty-six million, five hundred seventy thousand, six hundred fifty-six".