688607885 has 8 divisors (see below), whose sum is σ = 944376576. Its totient is φ = 472188240.

The previous prime is 688607869. The next prime is 688607921. The reversal of 688607885 is 588706886.

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

It is not a de Polignac number, because 688607885 - 2⁴ = 688607869 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 688607885.

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 7 ways as a sum of consecutive naturals, for example, 9837221 + ... + 9837290.

It is an arithmetic number, because the mean of its divisors is an integer number (118047072).

Almost surely, 2^688607885 is an apocalyptic number.

It is an amenable number.

688607885 is a deficient number, since it is larger than the sum of its proper divisors (255768691).

688607885 is a wasteful number, since it uses less digits than its factorization.

688607885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19674523.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The square root of 688607885 is about 26241.3392379276. The cubic root of 688607885 is about 883.0609166688.

Subtracting from 688607885 its reverse (588706886), we obtain a palindrome (99900999).

The spelling of 688607885 in words is "six hundred eighty-eight million, six hundred seven thousand, eight hundred eighty-five".