688828638 has 8 divisors (see below), whose sum is σ = 1377657288. Its totient is φ = 229609544.

The previous prime is 688828631. The next prime is 688828681. The reversal of 688828638 is 836828886.

688828638 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

688828638 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688828631) 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, 57402381 + ... + 57402392.

It is an arithmetic number, because the mean of its divisors is an integer number (172207161).

Almost surely, 2^688828638 is an apocalyptic number.

688828638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688828638 is a wasteful number, since it uses less digits than its factorization.

688828638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114804778.

The product of its digits is 7077888, while the sum is 57.

The square root of 688828638 is about 26245.5451076940. The cubic root of 688828638 is about 883.1552700851.

The spelling of 688828638 in words is "six hundred eighty-eight million, eight hundred twenty-eight thousand, six hundred thirty-eight".