28365866 has 4 divisors (see below), whose sum is σ = 42548802. Its totient is φ = 14182932.

The previous prime is 28365859. The next prime is 28365871. The reversal of 28365866 is 66856382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 26306641 + 2059225 = 5129^2 + 1435^2 .

It is a Curzon number.

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 as a sum of consecutive naturals, namely, 7091465 + ... + 7091468.

Almost surely, 2^28365866 is an apocalyptic number.

28365866 is a deficient number, since it is larger than the sum of its proper divisors (14182936).

28365866 is a wasteful number, since it uses less digits than its factorization.

28365866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14182935.

The product of its digits is 414720, while the sum is 44.

The square root of 28365866 is about 5325.9615094366. The cubic root of 28365866 is about 304.9757787807.

The spelling of 28365866 in words is "twenty-eight million, three hundred sixty-five thousand, eight hundred sixty-six".