28140811 has 2 divisors, whose sum is σ = 28140812. Its totient is φ = 28140810.

The previous prime is 28140803. The next prime is 28140829. The reversal of 28140811 is 11804182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28140811 - 2³ = 28140803 is a prime.

It is not a weakly prime, because it can be changed into another prime (28140011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14070405 + 14070406.

It is an arithmetic number, because the mean of its divisors is an integer number (14070406).

Almost surely, 2^28140811 is an apocalyptic number.

28140811 is a deficient number, since it is larger than the sum of its proper divisors (1).

28140811 is an equidigital number, since it uses as much as digits as its factorization.

28140811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 28140811 is about 5304.7913248308. The cubic root of 28140811 is about 304.1670761822.

Adding to 28140811 its reverse (11804182), we get a palindrome (39944993).

The spelling of 28140811 in words is "twenty-eight million, one hundred forty thousand, eight hundred eleven".