28056111720 has 256 divisors, whose sum is σ = 103880448000. Its totient is φ = 5903041536.

The previous prime is 28056111719. The next prime is 28056111737. The reversal of 28056111720 is 2711165082.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 4135291 + ... + 4142069.

It is an arithmetic number, because the mean of its divisors is an integer number (405783000).

Almost surely, 2^28056111720 is an apocalyptic number.

28056111720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28056111720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51940224000).

28056111720 is an abundant number, since it is smaller than the sum of its proper divisors (75824336280).

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

28056111720 is a wasteful number, since it uses less digits than its factorization.

28056111720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7192 (or 7188 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The spelling of 28056111720 in words is "twenty-eight billion, fifty-six million, one hundred eleven thousand, seven hundred twenty".