28166085 has 12 divisors (see below), whose sum is σ = 48821292. Its totient is φ = 15021888.

The previous prime is 28166081. The next prime is 28166119. The reversal of 28166085 is 58066182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16916769 + 11249316 = 4113^2 + 3354^2 .

It is not a de Polignac number, because 28166085 - 2² = 28166081 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312912 + ... + 313001.

It is an arithmetic number, because the mean of its divisors is an integer number (4068441).

Almost surely, 2^28166085 is an apocalyptic number.

It is an amenable number.

28166085 is a deficient number, since it is larger than the sum of its proper divisors (20655207).

28166085 is a wasteful number, since it uses less digits than its factorization.

28166085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625924 (or 625921 counting only the distinct ones).

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

The square root of 28166085 is about 5307.1729762652. The cubic root of 28166085 is about 304.2581090760.

It can be divided in two parts, 281 and 66085, that added together give a palindrome (66366).

The spelling of 28166085 in words is "twenty-eight million, one hundred sixty-six thousand, eighty-five".