28786664 has 16 divisors (see below), whose sum is σ = 54163620. Its totient is φ = 14343040.

The previous prime is 28786649. The next prime is 28786673. The reversal of 28786664 is 46668782.

It can be written as a sum of positive squares in 2 ways, for example, as 22486564 + 6300100 = 4742^2 + 2510^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3797 + ... + 8484.

Almost surely, 2^28786664 is an apocalyptic number.

It is an amenable number.

28786664 is a deficient number, since it is larger than the sum of its proper divisors (25376956).

28786664 is a wasteful number, since it uses less digits than its factorization.

28786664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12580 (or 12576 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 28786664 is about 5365.3204936891. The cubic root of 28786664 is about 306.4764531408.

The spelling of 28786664 in words is "twenty-eight million, seven hundred eighty-six thousand, six hundred sixty-four".