688680052 has 12 divisors (see below), whose sum is σ = 1246748580. Its totient is φ = 332466176.

The previous prime is 688680017. The next prime is 688680071. The reversal of 688680052 is 250086886.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 417221476 + 271458576 = 20426^2 + 16476^2 .

It is a junction number, because it is equal to n+sod(n) for n = 688679990 and 688680008.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 2968333 + ... + 2968564.

It is an arithmetic number, because the mean of its divisors is an integer number (103895715).

Almost surely, 2^688680052 is an apocalyptic number.

It is an amenable number.

688680052 is a deficient number, since it is larger than the sum of its proper divisors (558068528).

688680052 is a wasteful number, since it uses less digits than its factorization.

688680052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5936930 (or 5936928 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 43.

The square root of 688680052 is about 26242.7142651060. The cubic root of 688680052 is about 883.0917642346.

The spelling of 688680052 in words is "six hundred eighty-eight million, six hundred eighty thousand, fifty-two".