678686688 has 120 divisors (see below), whose sum is σ = 2101203720. Its totient is φ = 214306560.

The previous prime is 678686651. The next prime is 678686711. The reversal of 678686688 is 886686876.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42358 + ... + 56138.

It is an arithmetic number, because the mean of its divisors is an integer number (17510031).

Almost surely, 2^678686688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678686688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1050601860).

678686688 is an abundant number, since it is smaller than the sum of its proper divisors (1422517032).

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

678686688 is a wasteful number, since it uses less digits than its factorization.

678686688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13822 (or 13805 counting only the distinct ones).

The product of its digits is 37158912, while the sum is 63.

The square root of 678686688 is about 26051.6158424003. The cubic root of 678686688 is about 878.7994510379.

The spelling of 678686688 in words is "six hundred seventy-eight million, six hundred eighty-six thousand, six hundred eighty-eight".