28108211 has 2 divisors, whose sum is σ = 28108212. Its totient is φ = 28108210.

The previous prime is 28108193. The next prime is 28108217. The reversal of 28108211 is 11280182.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28108211 is a prime.

It is not a weakly prime, because it can be changed into another prime (28108217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14054105 + 14054106.

It is an arithmetic number, because the mean of its divisors is an integer number (14054106).

Almost surely, 2^28108211 is an apocalyptic number.

28108211 is a deficient number, since it is larger than the sum of its proper divisors (1).

28108211 is an equidigital number, since it uses as much as digits as its factorization.

28108211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 28108211 is about 5301.7177405064. The cubic root of 28108211 is about 304.0495756810.

Adding to 28108211 its reverse (11280182), we get a palindrome (39388393).

The spelling of 28108211 in words is "twenty-eight million, one hundred eight thousand, two hundred eleven".