28193658556 has 12 divisors (see below), whose sum is σ = 56387317168. Its totient is φ = 12082996512.

The previous prime is 28193658529. The next prime is 28193658607. The reversal of 28193658556 is 65585639182.

28193658556 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28193658556.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 503458161 + ... + 503458216.

Almost surely, 2^28193658556 is an apocalyptic number.

It is an amenable number.

28193658556 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28193658556 is a wasteful number, since it uses less digits than its factorization.

28193658556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1006916388 (or 1006916386 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 58.

The spelling of 28193658556 in words is "twenty-eight billion, one hundred ninety-three million, six hundred fifty-eight thousand, five hundred fifty-six".