28306664 has 32 divisors (see below), whose sum is σ = 54694440. Its totient is φ = 13728000.

The previous prime is 28306657. The next prime is 28306669. The reversal of 28306664 is 46660382.

It can be written as a sum of positive squares in 4 ways, for example, as 27478564 + 828100 = 5242^2 + 910^2 .

It is not an unprimeable number, because it can be changed into a prime (28306669) 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, 42494 + ... + 43154.

Almost surely, 2^28306664 is an apocalyptic number.

It is an amenable number.

28306664 is a deficient number, since it is larger than the sum of its proper divisors (26387776).

28306664 is a wasteful number, since it uses less digits than its factorization.

28306664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 28306664 is about 5320.4007367867. The cubic root of 28306664 is about 304.7634607838.

The spelling of 28306664 in words is "twenty-eight million, three hundred six thousand, six hundred sixty-four".