28186663387 has 16 divisors (see below), whose sum is σ = 28828548000. Its totient is φ = 27553275904.

The previous prime is 28186663333. The next prime is 28186663397. The reversal of 28186663387 is 78336668182.

It is a cyclic number.

It is not a de Polignac number, because 28186663387 - 2²³ = 28178274779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28186663397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4210539 + ... + 4217227.

It is an arithmetic number, because the mean of its divisors is an integer number (1801784250).

Almost surely, 2^28186663387 is an apocalyptic number.

28186663387 is a deficient number, since it is larger than the sum of its proper divisors (641884613).

28186663387 is a wasteful number, since it uses less digits than its factorization.

28186663387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7310.

The product of its digits is 13934592, while the sum is 58.

The spelling of 28186663387 in words is "twenty-eight billion, one hundred eighty-six million, six hundred sixty-three thousand, three hundred eighty-seven".