678680240 has 80 divisors (see below), whose sum is σ = 1807652160. Its totient is φ = 232135680.

The previous prime is 678680237. The next prime is 678680279. The reversal of 678680240 is 42086876.

678680240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283850 + ... + 286230.

It is an arithmetic number, because the mean of its divisors is an integer number (22595652).

Almost surely, 2^678680240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678680240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903826080).

678680240 is an abundant number, since it is smaller than the sum of its proper divisors (1128971920).

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

678680240 is a wasteful number, since it uses less digits than its factorization.

678680240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2910 (or 2904 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 678680240 is about 26051.4920877864. The cubic root of 678680240 is about 878.7966679586.

The spelling of 678680240 in words is "six hundred seventy-eight million, six hundred eighty thousand, two hundred forty".