28086791 has 4 divisors (see below), whose sum is σ = 28442400. Its totient is φ = 27731184.

The previous prime is 28086743. The next prime is 28086803. The reversal of 28086791 is 19768082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28086791 - 2⁶ = 28086727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28086701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177686 + ... + 177843.

It is an arithmetic number, because the mean of its divisors is an integer number (7110600).

Almost surely, 2^28086791 is an apocalyptic number.

28086791 is a deficient number, since it is larger than the sum of its proper divisors (355609).

28086791 is an equidigital number, since it uses as much as digits as its factorization.

28086791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355608.

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 28086791 is about 5299.6972555043. The cubic root of 28086791 is about 303.9723218972.

The spelling of 28086791 in words is "twenty-eight million, eighty-six thousand, seven hundred ninety-one".