28111843 has 2 divisors, whose sum is σ = 28111844. Its totient is φ = 28111842.

The previous prime is 28111841. The next prime is 28111871. The reversal of 28111843 is 34811182.

It is an a-pointer prime, because the next prime (28111871) can be obtained adding 28111843 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28111843 - 2¹ = 28111841 is a prime.

Together with 28111841, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28111841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14055921 + 14055922.

It is an arithmetic number, because the mean of its divisors is an integer number (14055922).

Almost surely, 2^28111843 is an apocalyptic number.

28111843 is a deficient number, since it is larger than the sum of its proper divisors (1).

28111843 is an equidigital number, since it uses as much as digits as its factorization.

28111843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 28.

The square root of 28111843 is about 5302.0602599367. The cubic root of 28111843 is about 304.0626710300.

The spelling of 28111843 in words is "twenty-eight million, one hundred eleven thousand, eight hundred forty-three".