28775866 has 16 divisors (see below), whose sum is σ = 52232256. Its totient is φ = 11606976.

The previous prime is 28775863. The next prime is 28775867. The reversal of 28775866 is 66857782.

It is not an unprimeable number, because it can be changed into a prime (28775863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60216 + ... + 60691.

It is an arithmetic number, because the mean of its divisors is an integer number (3264516).

Almost surely, 2^28775866 is an apocalyptic number.

28775866 is a deficient number, since it is larger than the sum of its proper divisors (23456390).

28775866 is a wasteful number, since it uses less digits than its factorization.

28775866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120933.

The product of its digits is 1128960, while the sum is 49.

The square root of 28775866 is about 5364.3141220477. The cubic root of 28775866 is about 306.4381281418.

The spelling of 28775866 in words is "twenty-eight million, seven hundred seventy-five thousand, eight hundred sixty-six".