28120189 has 8 divisors (see below), whose sum is σ = 28607040. Its totient is φ = 27636000.

The previous prime is 28120187. The next prime is 28120199. The reversal of 28120189 is 98102182.

It is a happy number.

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 28120189 - 2¹ = 28120187 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28120189.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28120187) 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, 42342 + ... + 43000.

It is an arithmetic number, because the mean of its divisors is an integer number (3575880).

Almost surely, 2^28120189 is an apocalyptic number.

It is an amenable number.

28120189 is a deficient number, since it is larger than the sum of its proper divisors (486851).

28120189 is an equidigital number, since it uses as much as digits as its factorization.

28120189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 28120189 is about 5302.8472540702. The cubic root of 28120189 is about 304.0927586572.

The spelling of 28120189 in words is "twenty-eight million, one hundred twenty thousand, one hundred eighty-nine".