28320589 has 16 divisors (see below), whose sum is σ = 32892480. Its totient is φ = 24098560.

The previous prime is 28320587. The next prime is 28320599. The reversal of 28320589 is 98502382.

It is a cyclic number.

It is not a de Polignac number, because 28320589 - 2¹ = 28320587 is a prime.

It is a super-2 number, since 2×28320589² = 1604111522613842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50022 + ... + 50584.

It is an arithmetic number, because the mean of its divisors is an integer number (2055780).

Almost surely, 2^28320589 is an apocalyptic number.

It is an amenable number.

28320589 is a deficient number, since it is larger than the sum of its proper divisors (4571891).

28320589 is a wasteful number, since it uses less digits than its factorization.

28320589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 28320589 is about 5321.7092179111. The cubic root of 28320589 is about 304.8134270567.

The spelling of 28320589 in words is "twenty-eight million, three hundred twenty thousand, five hundred eighty-nine".