28045189 has 8 divisors (see below), whose sum is σ = 30419928. Its totient is φ = 25751040.

The previous prime is 28045187. The next prime is 28045201. The reversal of 28045189 is 98154082.

It can be written as a sum of positive squares in 4 ways, for example, as 4133089 + 23912100 = 2033^2 + 4890^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28045189 - 2¹ = 28045187 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 (28045181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19422 + ... + 20815.

It is an arithmetic number, because the mean of its divisors is an integer number (3802491).

Almost surely, 2^28045189 is an apocalyptic number.

It is an amenable number.

28045189 is a deficient number, since it is larger than the sum of its proper divisors (2374739).

28045189 is a wasteful number, since it uses less digits than its factorization.

28045189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40295.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28045189 is about 5295.7708598466. The cubic root of 28045189 is about 303.8221670274.

The spelling of 28045189 in words is "twenty-eight million, forty-five thousand, one hundred eighty-nine".