688878 has 16 divisors (see below), whose sum is σ = 1530960. Its totient is φ = 229608.

The previous prime is 688871. The next prime is 688889. The reversal of 688878 is 878886.

688878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 688878.

It is not an unprimeable number, because it can be changed into a prime (688871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6325 + ... + 6432.

It is an arithmetic number, because the mean of its divisors is an integer number (95685).

2⁶⁸⁸⁸⁷⁸ is an apocalyptic number.

688878 is an abundant number, since it is smaller than the sum of its proper divisors (842082).

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

688878 is a wasteful number, since it uses less digits than its factorization.

688878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12768 (or 12762 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The square root of 688878 is about 829.9867468821. The cubic root of 688878 is about 88.3176365447.

The spelling of 688878 in words is "six hundred eighty-eight thousand, eight hundred seventy-eight".