678591856 has 20 divisors (see below), whose sum is σ = 1392111792. Its totient is φ = 319337216.

The previous prime is 678591853. The next prime is 678591857. The reversal of 678591856 is 658195876.

678591856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 678591797 and 678591806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678591853) 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, 1247140 + ... + 1247683.

Almost surely, 2^678591856 is an apocalyptic number.

It is an amenable number.

678591856 is an abundant number, since it is smaller than the sum of its proper divisors (713519936).

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

678591856 is a wasteful number, since it uses less digits than its factorization.

678591856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494848 (or 2494842 counting only the distinct ones).

The product of its digits is 3628800, while the sum is 55.

The square root of 678591856 is about 26049.7956997747. The cubic root of 678591856 is about 878.7585179668.

The spelling of 678591856 in words is "six hundred seventy-eight million, five hundred ninety-one thousand, eight hundred fifty-six".