28966688 has 12 divisors (see below), whose sum is σ = 57028230. Its totient is φ = 14483328.

The previous prime is 28966687. The next prime is 28966703. The reversal of 28966688 is 88666982.

It can be written as a sum of positive squares in only one way, i.e., 18905104 + 10061584 = 4348^2 + 3172^2 .

It is not an unprimeable number, because it can be changed into a prime (28966687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452573 + ... + 452636.

Almost surely, 2^28966688 is an apocalyptic number.

It is an amenable number.

28966688 is a deficient number, since it is larger than the sum of its proper divisors (28061542).

28966688 is an equidigital number, since it uses as much as digits as its factorization.

28966688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905219 (or 905211 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 53.

The square root of 28966688 is about 5382.0709768638. The cubic root of 28966688 is about 307.1139995448.

The spelling of 28966688 in words is "twenty-eight million, nine hundred sixty-six thousand, six hundred eighty-eight".