28208089 has 16 divisors (see below), whose sum is σ = 35054208. Its totient is φ = 22102272.

The previous prime is 28208071. The next prime is 28208093. The reversal of 28208089 is 98080282.

It is a cyclic number.

It is not a de Polignac number, because 28208089 - 2⁵ = 28208057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28208009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8289 + ... + 11185.

It is an arithmetic number, because the mean of its divisors is an integer number (2190888).

Almost surely, 2^28208089 is an apocalyptic number.

It is an amenable number.

28208089 is a deficient number, since it is larger than the sum of its proper divisors (6846119).

28208089 is a wasteful number, since it uses less digits than its factorization.

28208089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3024.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 28208089 is about 5311.1287877437. The cubic root of 28208089 is about 304.4092803625.

The spelling of 28208089 in words is "twenty-eight million, two hundred eight thousand, eighty-nine".