28165885 has 16 divisors (see below), whose sum is σ = 38813760. Its totient is φ = 19405440.

The previous prime is 28165883. The next prime is 28165897. The reversal of 28165885 is 58856182.

It is not a de Polignac number, because 28165885 - 2¹ = 28165883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28165883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12432 + ... + 14521.

It is an arithmetic number, because the mean of its divisors is an integer number (2425860).

Almost surely, 2^28165885 is an apocalyptic number.

It is an amenable number.

28165885 is a deficient number, since it is larger than the sum of its proper divisors (10647875).

28165885 is a wasteful number, since it uses less digits than its factorization.

28165885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26988.

The product of its digits is 153600, while the sum is 43.

The square root of 28165885 is about 5307.1541338084. The cubic root of 28165885 is about 304.2573889219.

It can be divided in two parts, 281 and 65885, that added together give a palindrome (66166).

The spelling of 28165885 in words is "twenty-eight million, one hundred sixty-five thousand, eight hundred eighty-five".