28186161 has 16 divisors (see below), whose sum is σ = 39014400. Its totient is φ = 18081360.

The previous prime is 28186159. The next prime is 28186189. The reversal of 28186161 is 16168182.

It is not a de Polignac number, because 28186161 - 2¹ = 28186159 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28186121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17746 + ... + 19268.

It is an arithmetic number, because the mean of its divisors is an integer number (2438400).

Almost surely, 2^28186161 is an apocalyptic number.

It is an amenable number.

28186161 is a deficient number, since it is larger than the sum of its proper divisors (10828239).

28186161 is a wasteful number, since it uses less digits than its factorization.

28186161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756.

The product of its digits is 4608, while the sum is 33.

The square root of 28186161 is about 5309.0640418062. The cubic root of 28186161 is about 304.3303808063.

The spelling of 28186161 in words is "twenty-eight million, one hundred eighty-six thousand, one hundred sixty-one".