28091589 has 16 divisors (see below), whose sum is σ = 38058240. Its totient is φ = 18429120.

The previous prime is 28091573. The next prime is 28091597. The reversal of 28091589 is 98519082.

It is a happy number.

It is not a de Polignac number, because 28091589 - 2⁴ = 28091573 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28091589.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28098589) 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, 88459 + ... + 88775.

It is an arithmetic number, because the mean of its divisors is an integer number (2378640).

Almost surely, 2^28091589 is an apocalyptic number.

It is an amenable number.

28091589 is a deficient number, since it is larger than the sum of its proper divisors (9966651).

28091589 is a wasteful number, since it uses less digits than its factorization.

28091589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28091589 is about 5300.1499035405. The cubic root of 28091589 is about 303.9896298690.

It can be divided in two parts, 28091 and 589, that added together give a triangular number (28680 = T₂₃₉).

The spelling of 28091589 in words is "twenty-eight million, ninety-one thousand, five hundred eighty-nine".