28111110011 has 4 divisors (see below), whose sum is σ = 28129330032. Its totient is φ = 28092889992.

The previous prime is 28111109987. The next prime is 28111110023. The reversal of 28111110011 is 11001111182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11001111182 = 2 ⋅5500555591.

It is a cyclic number.

It is not a de Polignac number, because 28111110011 - 2¹⁴ = 28111093627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28111110061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9107696 + ... + 9110781.

It is an arithmetic number, because the mean of its divisors is an integer number (7032332508).

Almost surely, 2^28111110011 is an apocalyptic number.

28111110011 is a deficient number, since it is larger than the sum of its proper divisors (18220021).

28111110011 is a wasteful number, since it uses less digits than its factorization.

28111110011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18220020.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 28111110011 its reverse (11001111182), we get a palindrome (39112221193).

The spelling of 28111110011 in words is "twenty-eight billion, one hundred eleven million, one hundred ten thousand, eleven".