688828885 has 4 divisors (see below), whose sum is σ = 826594668. Its totient is φ = 551063104.

The previous prime is 688828883. The next prime is 688828901. The reversal of 688828885 is 588828886.

688828885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 204432804 + 484396081 = 14298^2 + 22009^2 .

It is a cyclic number.

It is not a de Polignac number, because 688828885 - 2¹ = 688828883 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 (688828883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68882884 + ... + 68882893.

It is an arithmetic number, because the mean of its divisors is an integer number (206648667).

Almost surely, 2^688828885 is an apocalyptic number.

It is an amenable number.

688828885 is a deficient number, since it is larger than the sum of its proper divisors (137765783).

688828885 is a wasteful number, since it uses less digits than its factorization.

688828885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137765782.

The product of its digits is 15728640, while the sum is 61.

The square root of 688828885 is about 26245.5498132541. The cubic root of 688828885 is about 883.1553756456.

Subtracting from 688828885 its reverse (588828886), we obtain a palindrome (99999999).

The spelling of 688828885 in words is "six hundred eighty-eight million, eight hundred twenty-eight thousand, eight hundred eighty-five".