688681355 has 8 divisors (see below), whose sum is σ = 826673712. Its totient is φ = 550774368.

The previous prime is 688681313. The next prime is 688681361. The reversal of 688681355 is 553186886.

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 688681355 - 2¹⁸ = 688419211 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 1997 + ... + 37166.

It is an arithmetic number, because the mean of its divisors is an integer number (103334214).

Almost surely, 2^688681355 is an apocalyptic number.

688681355 is a deficient number, since it is larger than the sum of its proper divisors (137992357).

688681355 is a wasteful number, since it uses less digits than its factorization.

688681355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42685.

The product of its digits is 1382400, while the sum is 50.

The square root of 688681355 is about 26242.7390910324. The cubic root of 688681355 is about 883.0923211782.

The spelling of 688681355 in words is "six hundred eighty-eight million, six hundred eighty-one thousand, three hundred fifty-five".