28684643 has 8 divisors (see below), whose sum is σ = 31353168. Its totient is φ = 26082144.

The previous prime is 28684637. The next prime is 28684651. The reversal of 28684643 is 34648682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28684643 - 2⁸ = 28684387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28684643.

It is not an unprimeable number, because it can be changed into a prime (28684603) 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, 15596 + ... + 17337.

It is an arithmetic number, because the mean of its divisors is an integer number (3919146).

Almost surely, 2^28684643 is an apocalyptic number.

28684643 is a deficient number, since it is larger than the sum of its proper divisors (2668525).

28684643 is a wasteful number, since it uses less digits than its factorization.

28684643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33013.

The product of its digits is 221184, while the sum is 41.

The square root of 28684643 is about 5355.8046080864. The cubic root of 28684643 is about 306.1139699634.

The spelling of 28684643 in words is "twenty-eight million, six hundred eighty-four thousand, six hundred forty-three".