678123904 has 32 divisors (see below), whose sum is σ = 1409693040. Its totient is φ = 324318720.

The previous prime is 678123893. The next prime is 678123959. The reversal of 678123904 is 409321876.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112227 + ... + 118114.

Almost surely, 2^678123904 is an apocalyptic number.

678123904 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

678123904 is an abundant number, since it is smaller than the sum of its proper divisors (731569136).

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

678123904 is a wasteful number, since it uses less digits than its factorization.

678123904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230378 (or 230366 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 678123904 is about 26040.8122761177. The cubic root of 678123904 is about 878.5564763603.

The spelling of 678123904 in words is "six hundred seventy-eight million, one hundred twenty-three thousand, nine hundred four".