28375566 has 8 divisors (see below), whose sum is σ = 56751144. Its totient is φ = 9458520.

The previous prime is 28375549. The next prime is 28375631. The reversal of 28375566 is 66557382.

It is a sphenic number, since it is the product of 3 distinct primes.

28375566 is an admirable number.

It is a Curzon number.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 2364625 + ... + 2364636.

It is an arithmetic number, because the mean of its divisors is an integer number (7093893).

Almost surely, 2^28375566 is an apocalyptic number.

28375566 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28375566 is a wasteful number, since it uses less digits than its factorization.

28375566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4729266.

The product of its digits is 302400, while the sum is 42.

The square root of 28375566 is about 5326.8720652931. The cubic root of 28375566 is about 305.0105380216.

The spelling of 28375566 in words is "twenty-eight million, three hundred seventy-five thousand, five hundred sixty-six".