28543289 has 4 divisors (see below), whose sum is σ = 30222324. Its totient is φ = 26864256.

The previous prime is 28543259. The next prime is 28543327. The reversal of 28543289 is 98234582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98234582 = 2 ⋅49117291.

It can be written as a sum of positive squares in 2 ways, for example, as 20748025 + 7795264 = 4555^2 + 2792^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28543289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28543259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839492 + ... + 839525.

It is an arithmetic number, because the mean of its divisors is an integer number (7555581).

Almost surely, 2^28543289 is an apocalyptic number.

It is an amenable number.

28543289 is a deficient number, since it is larger than the sum of its proper divisors (1679035).

28543289 is a wasteful number, since it uses less digits than its factorization.

28543289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679034.

The product of its digits is 138240, while the sum is 41.

The square root of 28543289 is about 5342.5919739392. The cubic root of 28543289 is about 305.6103124689.

The spelling of 28543289 in words is "twenty-eight million, five hundred forty-three thousand, two hundred eighty-nine".