678545878 has 4 divisors (see below), whose sum is σ = 1017818820. Its totient is φ = 339272938.

The previous prime is 678545869. The next prime is 678545893. The reversal of 678545878 is 878545876.

It is a happy number.

678545878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 169636468 + ... + 169636471.

It is an arithmetic number, because the mean of its divisors is an integer number (254454705).

Almost surely, 2^678545878 is an apocalyptic number.

678545878 is a deficient number, since it is larger than the sum of its proper divisors (339272942).

678545878 is a wasteful number, since it uses less digits than its factorization.

678545878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339272941.

The product of its digits is 15052800, while the sum is 58.

The square root of 678545878 is about 26048.9131827030. The cubic root of 678545878 is about 878.7386707536.

The spelling of 678545878 in words is "six hundred seventy-eight million, five hundred forty-five thousand, eight hundred seventy-eight".