28290208 has 12 divisors (see below), whose sum is σ = 55696410. Its totient is φ = 14145088.

The previous prime is 28290203. The next prime is 28290209. The reversal of 28290208 is 80209282.

It can be written as a sum of positive squares in only one way, i.e., 16096144 + 12194064 = 4012^2 + 3492^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28290208.

It is not an unprimeable number, because it can be changed into a prime (28290203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 442003 + ... + 442066.

Almost surely, 2^28290208 is an apocalyptic number.

It is an amenable number.

28290208 is a deficient number, since it is larger than the sum of its proper divisors (27406202).

28290208 is an equidigital number, since it uses as much as digits as its factorization.

28290208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884079 (or 884071 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 28290208 is about 5318.8540119090. The cubic root of 28290208 is about 304.7043915404.

The spelling of 28290208 in words is "twenty-eight million, two hundred ninety thousand, two hundred eight".