28186065 has 24 divisors (see below), whose sum is σ = 50050728. Its totient is φ = 14664960.

The previous prime is 28186031. The next prime is 28186069. The reversal of 28186065 is 56068182.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1218816 + 26967249 = 1104^2 + 5193^2 .

It is not a de Polignac number, because 28186065 - 2¹¹ = 28184017 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28186069) 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 23 ways as a sum of consecutive naturals, for example, 5794 + ... + 9483.

It is an arithmetic number, because the mean of its divisors is an integer number (2085447).

Almost surely, 2^28186065 is an apocalyptic number.

It is an amenable number.

28186065 is a deficient number, since it is larger than the sum of its proper divisors (21864663).

28186065 is a wasteful number, since it uses less digits than its factorization.

28186065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15329 (or 15326 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 28186065 is about 5309.0550006569. The cubic root of 28186065 is about 304.3300352969.

The spelling of 28186065 in words is "twenty-eight million, one hundred eighty-six thousand, sixty-five".