28364189 has 6 divisors (see below), whose sum is σ = 32995134. Its totient is φ = 24312120.

The previous prime is 28364183. The next prime is 28364197. The reversal of 28364189 is 98146382.

It can be written as a sum of positive squares in only one way, i.e., 27931225 + 432964 = 5285^2 + 658^2 .

It is not a de Polignac number, because 28364189 - 2⁴ = 28364173 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 (28364183) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 289382 + ... + 289479.

It is an arithmetic number, because the mean of its divisors is an integer number (5499189).

Almost surely, 2^28364189 is an apocalyptic number.

It is an amenable number.

28364189 is a deficient number, since it is larger than the sum of its proper divisors (4630945).

28364189 is an equidigital number, since it uses as much as digits as its factorization.

28364189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 578875 (or 578868 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 28364189 is about 5325.8040707484. The cubic root of 28364189 is about 304.9697685704.

The spelling of 28364189 in words is "twenty-eight million, three hundred sixty-four thousand, one hundred eighty-nine".