28636663665018 has 32 divisors (see below), whose sum is σ = 60645478118400. Its totient is φ = 8983587415040.

The previous prime is 28636663664977. The next prime is 28636663665079. The reversal of 28636663665018 is 81056636663682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28636663665018.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5261343 + ... + 9217106.

It is an arithmetic number, because the mean of its divisors is an integer number (1895171191200).

Almost surely, 2^{28636663665018} is an apocalyptic number.

28636663665018 is an abundant number, since it is smaller than the sum of its proper divisors (32008814453382).

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

28636663665018 is a wasteful number, since it uses less digits than its factorization.

28636663665018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14497862.

The product of its (nonzero) digits is 268738560, while the sum is 66.

The spelling of 28636663665018 in words is "twenty-eight trillion, six hundred thirty-six billion, six hundred sixty-three million, six hundred sixty-five thousand, eighteen".