28055099 has 4 divisors (see below), whose sum is σ = 28652064. Its totient is φ = 27458136.

The previous prime is 28055057. The next prime is 28055119. The reversal of 28055099 is 99055082.

It is a happy number.

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 28055099 - 2²⁴ = 11277883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28055299) 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 in 3 ways as a sum of consecutive naturals, for example, 298412 + ... + 298505.

It is an arithmetic number, because the mean of its divisors is an integer number (7163016).

Almost surely, 2^28055099 is an apocalyptic number.

28055099 is a deficient number, since it is larger than the sum of its proper divisors (596965).

28055099 is an equidigital number, since it uses as much as digits as its factorization.

28055099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596964.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 28055099 is about 5296.7064294711. The cubic root of 28055099 is about 303.8579488402.

The spelling of 28055099 in words is "twenty-eight million, fifty-five thousand, ninety-nine".