28680223 has 16 divisors (see below), whose sum is σ = 33973632. Its totient is φ = 23868000.

The previous prime is 28680209. The next prime is 28680251. The reversal of 28680223 is 32208682.

It is a de Polignac number, because none of the positive numbers 2^k-28680223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684223) 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 in 15 ways as a sum of consecutive naturals, for example, 17968 + ... + 19498.

It is an arithmetic number, because the mean of its divisors is an integer number (2123352).

Almost surely, 2^28680223 is an apocalyptic number.

28680223 is a deficient number, since it is larger than the sum of its proper divisors (5293409).

28680223 is a wasteful number, since it uses less digits than its factorization.

28680223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1686.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 28680223 is about 5355.3919557769. The cubic root of 28680223 is about 306.0982461811.

The spelling of 28680223 in words is "twenty-eight million, six hundred eighty thousand, two hundred twenty-three".