28166568 has 32 divisors (see below), whose sum is σ = 70978560. Its totient is φ = 9313920.

The previous prime is 28166561. The next prime is 28166629. The reversal of 28166568 is 86566182.

It is not an unprimeable number, because it can be changed into a prime (28166561) 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 7 ways as a sum of consecutive naturals, for example, 1573 + ... + 7668.

It is an arithmetic number, because the mean of its divisors is an integer number (2218080).

Almost surely, 2^28166568 is an apocalyptic number.

It is an amenable number.

28166568 is an abundant number, since it is smaller than the sum of its proper divisors (42811992).

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

28166568 is a wasteful number, since it uses less digits than its factorization.

28166568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9377 (or 9373 counting only the distinct ones).

The product of its digits is 138240, while the sum is 42.

The square root of 28166568 is about 5307.2184805225. The cubic root of 28166568 is about 304.2598482341.

The spelling of 28166568 in words is "twenty-eight million, one hundred sixty-six thousand, five hundred sixty-eight".