28485589 has 4 divisors (see below), whose sum is σ = 31075200. Its totient is φ = 25895980.

The previous prime is 28485581. The next prime is 28485593. The reversal of 28485589 is 98558482.

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 not a de Polignac number, because 28485589 - 2³ = 28485581 is a prime.

It is a super-2 number, since 2×28485589² = 1622857561353842, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28485581) 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, 1294789 + ... + 1294810.

It is an arithmetic number, because the mean of its divisors is an integer number (7768800).

Almost surely, 2^28485589 is an apocalyptic number.

It is an amenable number.

28485589 is a deficient number, since it is larger than the sum of its proper divisors (2589611).

28485589 is a wasteful number, since it uses less digits than its factorization.

28485589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589610.

The product of its digits is 921600, while the sum is 49.

The square root of 28485589 is about 5337.1892415390. The cubic root of 28485589 is about 305.4042440592.

The spelling of 28485589 in words is "twenty-eight million, four hundred eighty-five thousand, five hundred eighty-nine".