18678678 has 32 divisors (see below), whose sum is σ = 38817792. Its totient is φ = 5985600.

The previous prime is 18678643. The next prime is 18678683. The reversal of 18678678 is 87687681.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18678678.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43123 + ... + 43553.

It is an arithmetic number, because the mean of its divisors is an integer number (1213056).

Almost surely, 2^18678678 is an apocalyptic number.

18678678 is an abundant number, since it is smaller than the sum of its proper divisors (20139114).

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

18678678 is a wasteful number, since it uses less digits than its factorization.

18678678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700.

The product of its digits is 903168, while the sum is 51.

The square root of 18678678 is about 4321.8836171281. The cubic root of 18678678 is about 265.3273656871.

The spelling of 18678678 in words is "eighteen million, six hundred seventy-eight thousand, six hundred seventy-eight".