678694038912 has 384 divisors, whose sum is σ = 2070091689120. Its totient is φ = 221261414400.

The previous prime is 678694038899. The next prime is 678694038931. The reversal of 678694038912 is 219830496876.

678694038912 is a `hidden beast` number, since 67 + 86 + 9 + 403 + 8 + 91 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a self number, because there is not a number n which added to its sum of digits gives 678694038912.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 891844612 + ... + 891845372.

Almost surely, 2^678694038912 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 678694038912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1035045844560).

678694038912 is an abundant number, since it is smaller than the sum of its proper divisors (1391397650208).

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

678694038912 is an equidigital number, since it uses as much as digits as its factorization.

678694038912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1384 (or 1360 counting only the distinct ones).

The product of its (nonzero) digits is 31352832, while the sum is 63.

The spelling of 678694038912 in words is "six hundred seventy-eight billion, six hundred ninety-four million, thirty-eight thousand, nine hundred twelve".