678810906 has 24 divisors (see below), whose sum is σ = 1518201984. Its totient is φ = 218971080.

The previous prime is 678810863. The next prime is 678810931. The reversal of 678810906 is 609018876.

It is a happy number.

678810906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×678810906² = 921568492209081672, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 607696 + ... + 608811.

It is an arithmetic number, because the mean of its divisors is an integer number (63258416).

Almost surely, 2^678810906 is an apocalyptic number.

678810906 is an abundant number, since it is smaller than the sum of its proper divisors (839391078).

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

678810906 is a wasteful number, since it uses less digits than its factorization.

678810906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216546 (or 1216543 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 678810906 is about 26053.9998080909. Note that the first 3 decimals coincide. The cubic root of 678810906 is about 878.8530624480.

The spelling of 678810906 in words is "six hundred seventy-eight million, eight hundred ten thousand, nine hundred six".