28000011111 has 8 divisors (see below), whose sum is σ = 37351994880. Its totient is φ = 18657350712.

The previous prime is 28000011089. The next prime is 28000011119. The reversal of 28000011111 is 11111000082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28000011111 - 2²⁶ = 27932902247 is a prime.

It is a super-2 number, since 2×28000011111² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000011119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2323831 + ... + 2335848.

It is an arithmetic number, because the mean of its divisors is an integer number (4668999360).

Almost surely, 2^28000011111 is an apocalyptic number.

28000011111 is a deficient number, since it is larger than the sum of its proper divisors (9351983769).

28000011111 is a wasteful number, since it uses less digits than its factorization.

28000011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4661685.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 28000011111 its reverse (11111000082), we get a palindrome (39111011193).

The spelling of 28000011111 in words is "twenty-eight billion, eleven thousand, one hundred eleven".