28061868 has 12 divisors (see below), whose sum is σ = 65477720. Its totient is φ = 9353952.

The previous prime is 28061833. The next prime is 28061881. The reversal of 28061868 is 86816082.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1169233 + ... + 1169256.

Almost surely, 2^28061868 is an apocalyptic number.

It is an amenable number.

28061868 is an abundant number, since it is smaller than the sum of its proper divisors (37415852).

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

28061868 is a wasteful number, since it uses less digits than its factorization.

28061868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338496 (or 2338494 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 28061868 is about 5297.3453729203. The cubic root of 28061868 is about 303.8823846722.

The spelling of 28061868 in words is "twenty-eight million, sixty-one thousand, eight hundred sixty-eight".