28104891 has 4 divisors (see below), whose sum is σ = 37473192. Its totient is φ = 18736592.

The previous prime is 28104883. The next prime is 28104899. The reversal of 28104891 is 19840182.

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

It is an interprime number because it is at equal distance from previous prime (28104883) and next prime (28104899).

It is a cyclic number.

It is not a de Polignac number, because 28104891 - 2³ = 28104883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28104899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4684146 + ... + 4684151.

It is an arithmetic number, because the mean of its divisors is an integer number (9368298).

Almost surely, 2^28104891 is an apocalyptic number.

28104891 is a deficient number, since it is larger than the sum of its proper divisors (9368301).

28104891 is an equidigital number, since it uses as much as digits as its factorization.

28104891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9368300.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 28104891 is about 5301.4046251913. The cubic root of 28104891 is about 304.0376042760.

The spelling of 28104891 in words is "twenty-eight million, one hundred four thousand, eight hundred ninety-one".