28516189 has 4 divisors (see below), whose sum is σ = 30709756. Its totient is φ = 26322624.

The previous prime is 28516153. The next prime is 28516217. The reversal of 28516189 is 98161582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11168964 + 17347225 = 3342^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 28516189 - 2⁹ = 28515677 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 (28516129) 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, 1096764 + ... + 1096789.

It is an arithmetic number, because the mean of its divisors is an integer number (7677439).

Almost surely, 2^28516189 is an apocalyptic number.

It is an amenable number.

28516189 is a deficient number, since it is larger than the sum of its proper divisors (2193567).

28516189 is a wasteful number, since it uses less digits than its factorization.

28516189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193566.

The product of its digits is 34560, while the sum is 40.

The square root of 28516189 is about 5340.0551495280. The cubic root of 28516189 is about 305.5135627924.

The spelling of 28516189 in words is "twenty-eight million, five hundred sixteen thousand, one hundred eighty-nine".