28256985468 has 36 divisors (see below), whose sum is σ = 71434559560. Its totient is φ = 9418048416.

The previous prime is 28256985467. The next prime is 28256985569. The reversal of 28256985468 is 86458965282.

28256985468 is a `hidden beast` number, since 2 + 8 + 2 + 569 + 8 + 5 + 4 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28256985467) 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 11 ways as a sum of consecutive naturals, for example, 386763 + ... + 453981.

Almost surely, 2^28256985468 is an apocalyptic number.

It is an amenable number.

28256985468 is an abundant number, since it is smaller than the sum of its proper divisors (43177574092).

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

28256985468 is a wasteful number, since it uses less digits than its factorization.

28256985468 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78906 (or 78901 counting only the distinct ones).

The product of its digits is 66355200, while the sum is 63.

The spelling of 28256985468 in words is "twenty-eight billion, two hundred fifty-six million, nine hundred eighty-five thousand, four hundred sixty-eight".