28814091 has 4 divisors (see below), whose sum is σ = 38418792. Its totient is φ = 19209392.

The previous prime is 28814077. The next prime is 28814129. The reversal of 28814091 is 19041882.

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 28814091 - 2⁵ = 28814059 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28814491) 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, 4802346 + ... + 4802351.

It is an arithmetic number, because the mean of its divisors is an integer number (9604698).

Almost surely, 2^28814091 is an apocalyptic number.

28814091 is a deficient number, since it is larger than the sum of its proper divisors (9604701).

28814091 is an equidigital number, since it uses as much as digits as its factorization.

28814091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9604700.

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

The square root of 28814091 is about 5367.8758368651. The cubic root of 28814091 is about 306.5737558539.

The spelling of 28814091 in words is "twenty-eight million, eight hundred fourteen thousand, ninety-one".