28189161 has 96 divisors (see below), whose sum is σ = 57456000. Its totient is φ = 13426560.

The previous prime is 28189159. The next prime is 28189219. The reversal of 28189161 is 16198182.

It is not a de Polignac number, because 28189161 - 2¹ = 28189159 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28189151) 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 95 ways as a sum of consecutive naturals, for example, 189115 + ... + 189263.

It is an arithmetic number, because the mean of its divisors is an integer number (598500).

Almost surely, 2^28189161 is an apocalyptic number.

28189161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28189161 is an abundant number, since it is smaller than the sum of its proper divisors (29266839).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28189161 is a wasteful number, since it uses less digits than its factorization.

28189161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196 (or 183 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 28189161 is about 5309.3465699651. The cubic root of 28189161 is about 304.3411775794.

The spelling of 28189161 in words is "twenty-eight million, one hundred eighty-nine thousand, one hundred sixty-one".