688308804 has 36 divisors (see below), whose sum is σ = 1741551084. Its totient is φ = 229217472.

The previous prime is 688308793. The next prime is 688308847. The reversal of 688308804 is 408803886.

It can be written as a sum of positive squares in 2 ways, for example, as 10227204 + 678081600 = 3198^2 + 26040^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 688308804.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31654 + ... + 48770.

It is an arithmetic number, because the mean of its divisors is an integer number (48376419).

Almost surely, 2^688308804 is an apocalyptic number.

It is an amenable number.

688308804 is an abundant number, since it is smaller than the sum of its proper divisors (1053242280).

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

688308804 is a wasteful number, since it uses less digits than its factorization.

688308804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18244 (or 18239 counting only the distinct ones).

The product of its (nonzero) digits is 294912, while the sum is 45.

The square root of 688308804 is about 26235.6399578893. The cubic root of 688308804 is about 882.9330524211.

The spelling of 688308804 in words is "six hundred eighty-eight million, three hundred eight thousand, eight hundred four".