28091093 has 2 divisors, whose sum is σ = 28091094. Its totient is φ = 28091092.

The previous prime is 28091081. The next prime is 28091117. The reversal of 28091093 is 39019082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18861649 + 9229444 = 4343^2 + 3038^2 .

It is a cyclic number.

It is not a de Polignac number, because 28091093 - 2⁸ = 28090837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091893) 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, 14045546 + 14045547.

It is an arithmetic number, because the mean of its divisors is an integer number (14045547).

Almost surely, 2^28091093 is an apocalyptic number.

It is an amenable number.

28091093 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091093 is an equidigital number, since it uses as much as digits as its factorization.

28091093 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 28091093 is about 5300.1031122045. The cubic root of 28091093 is about 303.9878407244.

The spelling of 28091093 in words is "twenty-eight million, ninety-one thousand, ninety-three".