28118791 has 2 divisors, whose sum is σ = 28118792. Its totient is φ = 28118790.

The previous prime is 28118789. The next prime is 28118801. The reversal of 28118791 is 19781182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28118791 - 2¹ = 28118789 is a prime.

Together with 28118789, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28118791.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28118771) 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, 14059395 + 14059396.

It is an arithmetic number, because the mean of its divisors is an integer number (14059396).

Almost surely, 2^28118791 is an apocalyptic number.

28118791 is a deficient number, since it is larger than the sum of its proper divisors (1).

28118791 is an equidigital number, since it uses as much as digits as its factorization.

28118791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8064, while the sum is 37.

The square root of 28118791 is about 5302.7154364533. The cubic root of 28118791 is about 304.0877192326.

The spelling of 28118791 in words is "twenty-eight million, one hundred eighteen thousand, seven hundred ninety-one".