28559989 has 4 divisors (see below), whose sum is σ = 28749280. Its totient is φ = 28370700.

The previous prime is 28559977. The next prime is 28560019. The reversal of 28559989 is 98995582.

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 not a de Polignac number, because 28559989 - 2¹¹ = 28557941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28559929) 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, 94419 + ... + 94720.

It is an arithmetic number, because the mean of its divisors is an integer number (7187320).

Almost surely, 2^28559989 is an apocalyptic number.

It is an amenable number.

28559989 is a deficient number, since it is larger than the sum of its proper divisors (189291).

28559989 is a wasteful number, since it uses less digits than its factorization.

28559989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189290.

The product of its digits is 2332800, while the sum is 55.

The square root of 28559989 is about 5344.1546571932. The cubic root of 28559989 is about 305.6699026256.

The spelling of 28559989 in words is "twenty-eight million, five hundred fifty-nine thousand, nine hundred eighty-nine".