28568537685 has 24 divisors (see below), whose sum is σ = 49522846464. Its totient is φ = 15235308000.

The previous prime is 28568537609. The next prime is 28568537687. The reversal of 28568537685 is 58673586582.

28568537685 is a `hidden beast` number, since 2 + 8 + 568 + 5 + 3 + 7 + 68 + 5 = 666.

It is not a de Polignac number, because 28568537685 - 2¹¹ = 28568535637 is a prime.

It is a super-2 number, since 2×28568537685² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28568537687) 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 23 ways as a sum of consecutive naturals, for example, 872724 + ... + 904866.

It is an arithmetic number, because the mean of its divisors is an integer number (2063451936).

Almost surely, 2^28568537685 is an apocalyptic number.

It is an amenable number.

28568537685 is a deficient number, since it is larger than the sum of its proper divisors (20954308779).

28568537685 is a wasteful number, since it uses less digits than its factorization.

28568537685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51905 (or 51902 counting only the distinct ones).

The product of its digits is 96768000, while the sum is 63.

The spelling of 28568537685 in words is "twenty-eight billion, five hundred sixty-eight million, five hundred thirty-seven thousand, six hundred eighty-five".