28665666 has 24 divisors (see below), whose sum is σ = 62210304. Its totient is φ = 9539640.

The previous prime is 28665647. The next prime is 28665671. The reversal of 28665666 is 66656682.

It is a super-3 number, since 3×28665666³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 17035 + ... + 18641.

It is an arithmetic number, because the mean of its divisors is an integer number (2592096).

Almost surely, 2^28665666 is an apocalyptic number.

28665666 is an abundant number, since it is smaller than the sum of its proper divisors (33544638).

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

28665666 is a wasteful number, since it uses less digits than its factorization.

28665666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2603 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 28665666 is about 5354.0326857426. The cubic root of 28665666 is about 306.0464494399.

It can be divided in two parts, 2 and 8665666, that added together give a palindrome (8665668).

The spelling of 28665666 in words is "twenty-eight million, six hundred sixty-five thousand, six hundred sixty-six".