28112011 has 2 divisors, whose sum is σ = 28112012. Its totient is φ = 28112010.

The previous prime is 28111997. The next prime is 28112023. The reversal of 28112011 is 11021182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28112011 - 2¹⁹ = 27587723 is a prime.

It is not a weakly prime, because it can be changed into another prime (28112111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14056005 + 14056006.

It is an arithmetic number, because the mean of its divisors is an integer number (14056006).

Almost surely, 2^28112011 is an apocalyptic number.

28112011 is a deficient number, since it is larger than the sum of its proper divisors (1).

28112011 is an equidigital number, since it uses as much as digits as its factorization.

28112011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 16.

The square root of 28112011 is about 5302.0761028110. The cubic root of 28112011 is about 304.0632767347.

Adding to 28112011 its reverse (11021182), we get a palindrome (39133193).

The spelling of 28112011 in words is "twenty-eight million, one hundred twelve thousand, eleven".