28708111 has 2 divisors, whose sum is σ = 28708112. Its totient is φ = 28708110.

The previous prime is 28708091. The next prime is 28708181. The reversal of 28708111 is 11180782.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28708111 - 2⁵ = 28708079 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28708111.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28708181) 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, 14354055 + 14354056.

It is an arithmetic number, because the mean of its divisors is an integer number (14354056).

Almost surely, 2^28708111 is an apocalyptic number.

28708111 is a deficient number, since it is larger than the sum of its proper divisors (1).

28708111 is an equidigital number, since it uses as much as digits as its factorization.

28708111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 28.

The square root of 28708111 is about 5357.9950541224. The cubic root of 28708111 is about 306.1974283770.

Adding to 28708111 its reverse (11180782), we get a palindrome (39888893).

The spelling of 28708111 in words is "twenty-eight million, seven hundred eight thousand, one hundred eleven".