688536404 has 12 divisors (see below), whose sum is σ = 1237504884. Its totient is φ = 334963584.

The previous prime is 688536391. The next prime is 688536413. The reversal of 688536404 is 404635886.

It can be written as a sum of positive squares in 2 ways, for example, as 449524804 + 239011600 = 21202^2 + 15460^2 .

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, 2325989 + ... + 2326284.

It is an arithmetic number, because the mean of its divisors is an integer number (103125407).

Almost surely, 2^688536404 is an apocalyptic number.

It is an amenable number.

688536404 is a deficient number, since it is larger than the sum of its proper divisors (548968480).

688536404 is a wasteful number, since it uses less digits than its factorization.

688536404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4652314 (or 4652312 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 688536404 is about 26239.9772103560. The cubic root of 688536404 is about 883.0303602070.

It can be divided in two parts, 68853 and 6404, that added together give a palindrome (75257).

The spelling of 688536404 in words is "six hundred eighty-eight million, five hundred thirty-six thousand, four hundred four".