28000111 has 4 divisors (see below), whose sum is σ = 28011312. Its totient is φ = 27988912.

The previous prime is 28000097. The next prime is 28000121. The reversal of 28000111 is 11100082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28000111 - 2⁹ = 27999599 is a prime.

It is a Duffinian number.

28000111 is a Rhonda number in base 9.

28000111 is a modest number, since divided by 111 gives 28 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 28000091 and 28000100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28000121) 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, 51 + ... + 7483.

It is an arithmetic number, because the mean of its divisors is an integer number (7002828).

Almost surely, 2^28000111 is an apocalyptic number.

28000111 is a deficient number, since it is larger than the sum of its proper divisors (11201).

28000111 is an equidigital number, since it uses as much as digits as its factorization.

28000111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11200.

The product of its (nonzero) digits is 16, while the sum is 13.

The square root of 28000111 is about 5291.5131106329. The cubic root of 28000111 is about 303.6592984506.

Adding to 28000111 its reverse (11100082), we get a palindrome (39100193).

The spelling of 28000111 in words is "twenty-eight million, one hundred eleven", and thus it is an aban number.