688856542 has 8 divisors (see below), whose sum is σ = 1127219832. Its totient is φ = 313116600.

The previous prime is 688856513. The next prime is 688856561. The reversal of 688856542 is 245658886.

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

It is a self number, because there is not a number n which added to its sum of digits gives 688856542.

It is a congruent 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 in 3 ways as a sum of consecutive naturals, for example, 15655809 + ... + 15655852.

It is an arithmetic number, because the mean of its divisors is an integer number (140902479).

Almost surely, 2^688856542 is an apocalyptic number.

688856542 is a deficient number, since it is larger than the sum of its proper divisors (438363290).

688856542 is a wasteful number, since it uses less digits than its factorization.

688856542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31311674.

The product of its digits is 3686400, while the sum is 52.

The square root of 688856542 is about 26246.0766972894. The cubic root of 688856542 is about 883.1671952725.

The spelling of 688856542 in words is "six hundred eighty-eight million, eight hundred fifty-six thousand, five hundred forty-two".