28165868 has 6 divisors (see below), whose sum is σ = 49290276. Its totient is φ = 14082932.

The previous prime is 28165867. The next prime is 28165877. The reversal of 28165868 is 86856182.

It is a super-3 number, since 3×28165868³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (28165861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3520730 + ... + 3520737.

It is an arithmetic number, because the mean of its divisors is an integer number (8215046).

Almost surely, 2^28165868 is an apocalyptic number.

It is an amenable number.

28165868 is a deficient number, since it is larger than the sum of its proper divisors (21124408).

28165868 is a wasteful number, since it uses less digits than its factorization.

28165868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041471 (or 7041469 counting only the distinct ones).

The product of its digits is 184320, while the sum is 44.

The square root of 28165868 is about 5307.1525321965. The cubic root of 28165868 is about 304.2573277086.

The spelling of 28165868 in words is "twenty-eight million, one hundred sixty-five thousand, eight hundred sixty-eight".