28001889 has 16 divisors (see below), whose sum is σ = 41891200. Its totient is φ = 18484848.

The previous prime is 28001881. The next prime is 28001899. The reversal of 28001889 is 98810082.

It is not a de Polignac number, because 28001889 - 2³ = 28001881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28001881) 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, 2254 + ... + 7815.

It is an arithmetic number, because the mean of its divisors is an integer number (2618200).

Almost surely, 2^28001889 is an apocalyptic number.

It is an amenable number.

28001889 is a deficient number, since it is larger than the sum of its proper divisors (13889311).

28001889 is a wasteful number, since it uses less digits than its factorization.

28001889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10181 (or 10175 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 28001889 is about 5291.6811128412. The cubic root of 28001889 is about 303.6657257442.

The spelling of 28001889 in words is "twenty-eight million, one thousand, eight hundred eighty-nine".