28811113 has 2 divisors, whose sum is σ = 28811114. Its totient is φ = 28811112.

The previous prime is 28811099. The next prime is 28811119. The reversal of 28811113 is 31111882.

28811113 is nontrivially palindromic in base 8.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18774889 + 10036224 = 4333^2 + 3168^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28811113 is a prime.

It is not a weakly prime, because it can be changed into another prime (28811119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14405556 + 14405557.

It is an arithmetic number, because the mean of its divisors is an integer number (14405557).

Almost surely, 2^28811113 is an apocalyptic number.

It is an amenable number.

28811113 is a deficient number, since it is larger than the sum of its proper divisors (1).

28811113 is an equidigital number, since it uses as much as digits as its factorization.

28811113 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 384, while the sum is 25.

The square root of 28811113 is about 5367.5984387806. The cubic root of 28811113 is about 306.5631937982.

Adding to 28811113 its reverse (31111882), we get a palindrome (59922995).

The spelling of 28811113 in words is "twenty-eight million, eight hundred eleven thousand, one hundred thirteen".