28330189 has 4 divisors (see below), whose sum is σ = 28374624. Its totient is φ = 28285756.

The previous prime is 28330153. The next prime is 28330193. The reversal of 28330189 is 98103382.

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 28330189 - 2¹⁷ = 28199117 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 (28330889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21247 + ... + 22540.

It is an arithmetic number, because the mean of its divisors is an integer number (7093656).

Almost surely, 2^28330189 is an apocalyptic number.

It is an amenable number.

28330189 is a deficient number, since it is larger than the sum of its proper divisors (44435).

28330189 is an equidigital number, since it uses as much as digits as its factorization.

28330189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44434.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28330189 is about 5322.6111073420. The cubic root of 28330189 is about 304.8478646446.

The spelling of 28330189 in words is "twenty-eight million, three hundred thirty thousand, one hundred eighty-nine".