28056285720 has 96 divisors (see below), whose sum is σ = 91879135920. Its totient is φ = 7424551680.

The previous prime is 28056285701. The next prime is 28056285721. The reversal of 28056285720 is 2758265082.

28056285720 is a `hidden beast` number, since 2 + 8 + 0 + 56 + 28 + 572 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28056285721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 250299 + ... + 344618.

Almost surely, 2^28056285720 is an apocalyptic number.

28056285720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28056285720 is an abundant number, since it is smaller than the sum of its proper divisors (63822850200).

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

28056285720 is a wasteful number, since it uses less digits than its factorization.

28056285720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 595065 (or 595058 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 28056285720 in words is "twenty-eight billion, fifty-six million, two hundred eighty-five thousand, seven hundred twenty".