28091841 has 4 divisors (see below), whose sum is σ = 37455792. Its totient is φ = 18727892.

The previous prime is 28091831. The next prime is 28091863. The reversal of 28091841 is 14819082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28091841 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28091801) 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, 4681971 + ... + 4681976.

It is an arithmetic number, because the mean of its divisors is an integer number (9363948).

Almost surely, 2^28091841 is an apocalyptic number.

It is an amenable number.

28091841 is a deficient number, since it is larger than the sum of its proper divisors (9363951).

28091841 is an equidigital number, since it uses as much as digits as its factorization.

28091841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9363950.

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

The square root of 28091841 is about 5300.1736763997. The cubic root of 28091841 is about 303.9905388618.

The spelling of 28091841 in words is "twenty-eight million, ninety-one thousand, eight hundred forty-one".