28057589 has 4 divisors (see below), whose sum is σ = 32065824. Its totient is φ = 24049356.

The previous prime is 28057583. The next prime is 28057597. The reversal of 28057589 is 98575082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28057589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28057583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2004107 + ... + 2004120.

It is an arithmetic number, because the mean of its divisors is an integer number (8016456).

Almost surely, 2^28057589 is an apocalyptic number.

It is an amenable number.

28057589 is a deficient number, since it is larger than the sum of its proper divisors (4008235).

28057589 is an equidigital number, since it uses as much as digits as its factorization.

28057589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4008234.

The product of its (nonzero) digits is 201600, while the sum is 44.

The square root of 28057589 is about 5296.9414759840. The cubic root of 28057589 is about 303.8669381022.

The spelling of 28057589 in words is "twenty-eight million, fifty-seven thousand, five hundred eighty-nine".