28890688 has 28 divisors (see below), whose sum is σ = 57515760. Its totient is φ = 14398592.

The previous prime is 28890683. The next prime is 28890703. The reversal of 28890688 is 88609882.

It is a super-2 number, since 2×28890688² = 1669343706226688, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28890683) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 27843 + ... + 28861.

Almost surely, 2^28890688 is an apocalyptic number.

It is an amenable number.

28890688 is a deficient number, since it is larger than the sum of its proper divisors (28625072).

28890688 is a wasteful number, since it uses less digits than its factorization.

28890688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474 (or 1464 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 49.

The square root of 28890688 is about 5375.0058604619. The cubic root of 28890688 is about 306.8451722771.

Adding to 28890688 its product of nonzero digits (442368), we get a square (29333056 = 5416²).

The spelling of 28890688 in words is "twenty-eight million, eight hundred ninety thousand, six hundred eighty-eight".