678706187886 has 32 divisors (see below), whose sum is σ = 1509779832480. Its totient is φ = 226003817088.

The previous prime is 678706187881. The next prime is 678706187897. The reversal of 678706187886 is 688781607876.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678706187881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6379501 + ... + 6485016.

It is an arithmetic number, because the mean of its divisors is an integer number (47180619765).

Almost surely, 2^678706187886 is an apocalyptic number.

678706187886 is an abundant number, since it is smaller than the sum of its proper divisors (831073644594).

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

678706187886 is a wasteful number, since it uses less digits than its factorization.

678706187886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12865505 (or 12865499 counting only the distinct ones).

The product of its (nonzero) digits is 303464448, while the sum is 72.

The spelling of 678706187886 in words is "six hundred seventy-eight billion, seven hundred six million, one hundred eighty-seven thousand, eight hundred eighty-six".