688681189 has 8 divisors (see below), whose sum is σ = 789970688. Its totient is φ = 588118320.

The previous prime is 688681187. The next prime is 688681219. The reversal of 688681189 is 981186886.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 688681189 - 2¹ = 688681187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688681187) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 179622 + ... + 183415.

It is an arithmetic number, because the mean of its divisors is an integer number (98746336).

Almost surely, 2^688681189 is an apocalyptic number.

It is an amenable number.

688681189 is a deficient number, since it is larger than the sum of its proper divisors (101289499).

688681189 is a wasteful number, since it uses less digits than its factorization.

688681189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 363315.

The product of its digits is 1327104, while the sum is 55.

The square root of 688681189 is about 26242.7359282526. The cubic root of 688681189 is about 883.0922502245.

The spelling of 688681189 in words is "six hundred eighty-eight million, six hundred eighty-one thousand, one hundred eighty-nine".