688904108 has 6 divisors (see below), whose sum is σ = 1205582196. Its totient is φ = 344452052.

The previous prime is 688904093. The next prime is 688904137. The reversal of 688904108 is 801409886.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86113010 + ... + 86113017.

It is an arithmetic number, because the mean of its divisors is an integer number (200930366).

Almost surely, 2^688904108 is an apocalyptic number.

It is an amenable number.

688904108 is a deficient number, since it is larger than the sum of its proper divisors (516678088).

688904108 is a wasteful number, since it uses less digits than its factorization.

688904108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172226031 (or 172226029 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 688904108 is about 26246.9828361280. The cubic root of 688904108 is about 883.1875225644.

The spelling of 688904108 in words is "six hundred eighty-eight million, nine hundred four thousand, one hundred eight".