678139886 has 16 divisors (see below), whose sum is σ = 1067113440. Its totient is φ = 322764960.

The previous prime is 678139873. The next prime is 678139907. The reversal of 678139886 is 688931876.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78221 + ... + 86456.

It is an arithmetic number, because the mean of its divisors is an integer number (66694590).

Almost surely, 2^678139886 is an apocalyptic number.

678139886 is a deficient number, since it is larger than the sum of its proper divisors (388973554).

678139886 is a wasteful number, since it uses less digits than its factorization.

678139886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164779.

The product of its digits is 3483648, while the sum is 56.

The square root of 678139886 is about 26041.1191387774. The cubic root of 678139886 is about 878.5633782353.

The spelling of 678139886 in words is "six hundred seventy-eight million, one hundred thirty-nine thousand, eight hundred eighty-six".