28816666 has 8 divisors (see below), whose sum is σ = 45767700. Its totient is φ = 13560768.

The previous prime is 28816661. The next prime is 28816693. The reversal of 28816666 is 66661882.

It can be written as a sum of positive squares in 2 ways, for example, as 28355625 + 461041 = 5325^2 + 679^2 .

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

It is not an unprimeable number, because it can be changed into a prime (28816661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423741 + ... + 423808.

Almost surely, 2^28816666 is an apocalyptic number.

28816666 is a deficient number, since it is larger than the sum of its proper divisors (16951034).

28816666 is a wasteful number, since it uses less digits than its factorization.

28816666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847568.

The product of its digits is 165888, while the sum is 43.

The square root of 28816666 is about 5368.1156842974. The cubic root of 28816666 is about 306.5828880051.

The spelling of 28816666 in words is "twenty-eight million, eight hundred sixteen thousand, six hundred sixty-six".