28301011111 has 4 divisors (see below), whose sum is σ = 28422474912. Its totient is φ = 28179547312.

The previous prime is 28301011091. The next prime is 28301011127. The reversal of 28301011111 is 11111010382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28301011111 - 2⁹ = 28301010599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28301071111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60731551 + ... + 60732016.

It is an arithmetic number, because the mean of its divisors is an integer number (7105618728).

Almost surely, 2^28301011111 is an apocalyptic number.

28301011111 is a deficient number, since it is larger than the sum of its proper divisors (121463801).

28301011111 is a wasteful number, since it uses less digits than its factorization.

28301011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121463800.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 28301011111 its reverse (11111010382), we get a palindrome (39412021493).

The spelling of 28301011111 in words is "twenty-eight billion, three hundred one million, eleven thousand, one hundred eleven".