28189869 has 8 divisors (see below), whose sum is σ = 38202912. Its totient is φ = 18485040.

The previous prime is 28189867. The next prime is 28189873. The reversal of 28189869 is 96898182.

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

It is not a de Polignac number, because 28189869 - 2¹ = 28189867 is a prime.

It is a super-2 number, since 2×28189869² = 1589337428474322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76839 + ... + 77204.

It is an arithmetic number, because the mean of its divisors is an integer number (4775364).

Almost surely, 2^28189869 is an apocalyptic number.

It is an amenable number.

28189869 is a deficient number, since it is larger than the sum of its proper divisors (10013043).

28189869 is a wasteful number, since it uses less digits than its factorization.

28189869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154107.

The product of its digits is 497664, while the sum is 51.

The square root of 28189869 is about 5309.4132444179. The cubic root of 28189869 is about 304.3437255061.

The spelling of 28189869 in words is "twenty-eight million, one hundred eighty-nine thousand, eight hundred sixty-nine".