678045906 has 24 divisors (see below), whose sum is σ = 1472290560. Its totient is φ = 225524376.

The previous prime is 678045899. The next prime is 678045917. The reversal of 678045906 is 609540876.

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, 32346 + ... + 49013.

It is an arithmetic number, because the mean of its divisors is an integer number (61345440).

Almost surely, 2^678045906 is an apocalyptic number.

678045906 is an abundant number, since it is smaller than the sum of its proper divisors (794244654).

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

678045906 is a wasteful number, since it uses less digits than its factorization.

678045906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81830 (or 81827 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 678045906 is about 26039.3146223168. The cubic root of 678045906 is about 878.5227911320.

The spelling of 678045906 in words is "six hundred seventy-eight million, forty-five thousand, nine hundred six".