28678688018 has 6 divisors (see below), whose sum is σ = 43018391271. Its totient is φ = 14339224262.

The previous prime is 28678687981. The next prime is 28678688053. The reversal of 28678688018 is 81088687682.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 14339344009 + 14339344009 = 119747^2 + 119747^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=119747.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 179621 + ... + 299367.

Almost surely, 2^28678688018 is an apocalyptic number.

28678688018 is a deficient number, since it is larger than the sum of its proper divisors (14339703253).

28678688018 is an frugal number, since it uses more digits than its factorization.

28678688018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239496 (or 119749 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 62.

The spelling of 28678688018 in words is "twenty-eight billion, six hundred seventy-eight million, six hundred eighty-eight thousand, eighteen".