28557368556 has 12 divisors (see below), whose sum is σ = 66633859992. Its totient is φ = 9519122848.

The previous prime is 28557368551. The next prime is 28557368611. The reversal of 28557368556 is 65586375582.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 28557368556.

It is not an unprimeable number, because it can be changed into a prime (28557368551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1189890345 + ... + 1189890368.

It is an arithmetic number, because the mean of its divisors is an integer number (5552821666).

Almost surely, 2^28557368556 is an apocalyptic number.

It is an amenable number.

28557368556 is an abundant number, since it is smaller than the sum of its proper divisors (38076491436).

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

28557368556 is a wasteful number, since it uses less digits than its factorization.

28557368556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379780720 (or 2379780718 counting only the distinct ones).

The product of its digits is 60480000, while the sum is 60.

The spelling of 28557368556 in words is "twenty-eight billion, five hundred fifty-seven million, three hundred sixty-eight thousand, five hundred fifty-six".