28549289 has 4 divisors (see below), whose sum is σ = 28560000. Its totient is φ = 28538580.

The previous prime is 28549277. The next prime is 28549309. The reversal of 28549289 is 98294582.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 98294582 = 2 ⋅49147291.

It is a cyclic number.

It is not a de Polignac number, because 28549289 - 2¹⁶ = 28483753 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28549259) 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, 2144 + ... + 7854.

It is an arithmetic number, because the mean of its divisors is an integer number (7140000).

Almost surely, 2^28549289 is an apocalyptic number.

It is an amenable number.

28549289 is a deficient number, since it is larger than the sum of its proper divisors (10711).

28549289 is an equidigital number, since it uses as much as digits as its factorization.

28549289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10710.

The product of its digits is 414720, while the sum is 47.

The square root of 28549289 is about 5343.1534696282. The cubic root of 28549289 is about 305.6317247807.

The spelling of 28549289 in words is "twenty-eight million, five hundred forty-nine thousand, two hundred eighty-nine".