28091663 has 2 divisors, whose sum is σ = 28091664. Its totient is φ = 28091662.

The previous prime is 28091629. The next prime is 28091677. The reversal of 28091663 is 36619082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28091663 - 2¹⁰ = 28090639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28091563) 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, 14045831 + 14045832.

It is an arithmetic number, because the mean of its divisors is an integer number (14045832).

Almost surely, 2^28091663 is an apocalyptic number.

28091663 is a deficient number, since it is larger than the sum of its proper divisors (1).

28091663 is an equidigital number, since it uses as much as digits as its factorization.

28091663 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 28091663 is about 5300.1568844705. The cubic root of 28091663 is about 303.9898967960.

The spelling of 28091663 in words is "twenty-eight million, ninety-one thousand, six hundred sixty-three".