678120905 has 48 divisors (see below), whose sum is σ = 1082471040. Its totient is φ = 397816320.

The previous prime is 678120901. The next prime is 678120943. The reversal of 678120905 is 509021876.

678120905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678120905 - 2² = 678120901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678120901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67286 + ... + 76704.

It is an arithmetic number, because the mean of its divisors is an integer number (22551480).

Almost surely, 2^678120905 is an apocalyptic number.

It is an amenable number.

678120905 is a deficient number, since it is larger than the sum of its proper divisors (404350135).

678120905 is a wasteful number, since it uses less digits than its factorization.

678120905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9470 (or 9459 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 678120905 is about 26040.7546933648. The cubic root of 678120905 is about 878.5551812210. Note that the first 3 decimals are identical.

The spelling of 678120905 in words is "six hundred seventy-eight million, one hundred twenty thousand, nine hundred five".