28189549 has 4 divisors (see below), whose sum is σ = 28225120. Its totient is φ = 28153980.

The previous prime is 28189543. The next prime is 28189583. The reversal of 28189549 is 94598182.

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 28189549 - 2⁵ = 28189517 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28189499 and 28189508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189543) 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, 16569 + ... + 18190.

It is an arithmetic number, because the mean of its divisors is an integer number (7056280).

Almost surely, 2^28189549 is an apocalyptic number.

It is an amenable number.

28189549 is a deficient number, since it is larger than the sum of its proper divisors (35571).

28189549 is an equidigital number, since it uses as much as digits as its factorization.

28189549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35570.

The product of its digits is 207360, while the sum is 46.

The square root of 28189549 is about 5309.3831091757. The cubic root of 28189549 is about 304.3425739061.

The spelling of 28189549 in words is "twenty-eight million, one hundred eighty-nine thousand, five hundred forty-nine".