688305104 has 20 divisors (see below), whose sum is σ = 1334083140. Its totient is φ = 344025600.

The previous prime is 688305091. The next prime is 688305119. The reversal of 688305104 is 401503886.

It can be written as a sum of positive squares in 2 ways, for example, as 111344704 + 576960400 = 10552^2 + 24020^2 .

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, 49304 + ... + 61704.

It is an arithmetic number, because the mean of its divisors is an integer number (66704157).

Almost surely, 2^688305104 is an apocalyptic number.

It is an amenable number.

688305104 is a deficient number, since it is larger than the sum of its proper divisors (645778036).

688305104 is a wasteful number, since it uses less digits than its factorization.

688305104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15878 (or 15872 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 688305104 is about 26235.5694430291. The cubic root of 688305104 is about 882.9314703511.

The spelling of 688305104 in words is "six hundred eighty-eight million, three hundred five thousand, one hundred four".