678856686456 has 64 divisors (see below), whose sum is σ = 1839957588000. Its totient is φ = 207477093888.

The previous prime is 678856686419. The next prime is 678856686523. The reversal of 678856686456 is 654686658876.

It is a happy number.

It is a congruent number.

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, 7254931 + ... + 7347906.

Almost surely, 2^678856686456 is an apocalyptic number.

It is an amenable number.

678856686456 is an abundant number, since it is smaller than the sum of its proper divisors (1161100901544).

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

678856686456 is a wasteful number, since it uses less digits than its factorization.

678856686456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14603008 (or 14603004 counting only the distinct ones).

The product of its digits is 2786918400, while the sum is 75.

The spelling of 678856686456 in words is "six hundred seventy-eight billion, eight hundred fifty-six million, six hundred eighty-six thousand, four hundred fifty-six".