28056111775 has 12 divisors (see below), whose sum is σ = 35097454512. Its totient is φ = 22246259840.

The previous prime is 28056111763. The next prime is 28056111791. The reversal of 28056111775 is 57711165082.

It is not a de Polignac number, because 28056111775 - 2¹⁹ = 28055587487 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4962859 + ... + 4968508.

It is an arithmetic number, because the mean of its divisors is an integer number (2924787876).

Almost surely, 2^28056111775 is an apocalyptic number.

28056111775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28056111775 is a deficient number, since it is larger than the sum of its proper divisors (7041342737).

28056111775 is a wasteful number, since it uses less digits than its factorization.

28056111775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9931490 (or 9931485 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 43.

The spelling of 28056111775 in words is "twenty-eight billion, fifty-six million, one hundred eleven thousand, seven hundred seventy-five".