28531089 has 8 divisors (see below), whose sum is σ = 42268320. Its totient is φ = 19020708.

The previous prime is 28531081. The next prime is 28531093. The reversal of 28531089 is 98013582.

It is not a de Polignac number, because 28531089 - 2³ = 28531081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28531081) 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 7 ways as a sum of consecutive naturals, for example, 528327 + ... + 528380.

It is an arithmetic number, because the mean of its divisors is an integer number (5283540).

Almost surely, 2^28531089 is an apocalyptic number.

It is an amenable number.

28531089 is a deficient number, since it is larger than the sum of its proper divisors (13737231).

28531089 is a wasteful number, since it uses less digits than its factorization.

28531089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056716 (or 1056710 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 28531089 is about 5341.4500840128. The cubic root of 28531089 is about 305.5667648462.

The spelling of 28531089 in words is "twenty-eight million, five hundred thirty-one thousand, eighty-nine".