28564537689 has 24 divisors (see below), whose sum is σ = 41468263200. Its totient is φ = 18947016000.

The previous prime is 28564537643. The next prime is 28564537697. The reversal of 28564537689 is 98673546582.

It is a happy number.

28564537689 is a `hidden beast` number, since 2 + 8 + 564 + 5 + 3 + 7 + 68 + 9 = 666.

It is not a de Polignac number, because 28564537689 - 2¹⁵ = 28564504921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28564537619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2295717 + ... + 2308125.

It is an arithmetic number, because the mean of its divisors is an integer number (1727844300).

Almost surely, 2^28564537689 is an apocalyptic number.

It is an amenable number.

28564537689 is a deficient number, since it is larger than the sum of its proper divisors (12903725511).

28564537689 is a wasteful number, since it uses less digits than its factorization.

28564537689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13685 (or 13682 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 28564537689 in words is "twenty-eight billion, five hundred sixty-four million, five hundred thirty-seven thousand, six hundred eighty-nine".