28368321 has 16 divisors (see below), whose sum is σ = 38949120. Its totient is φ = 18358160.

The previous prime is 28368299. The next prime is 28368337. The reversal of 28368321 is 12386382.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28368321 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28368341) 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, 13726 + ... + 15656.

It is an arithmetic number, because the mean of its divisors is an integer number (2434320).

Almost surely, 2^28368321 is an apocalyptic number.

It is an amenable number.

28368321 is a deficient number, since it is larger than the sum of its proper divisors (10580799).

28368321 is a wasteful number, since it uses less digits than its factorization.

28368321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2076.

The product of its digits is 13824, while the sum is 33.

The square root of 28368321 is about 5326.1919792662. The cubic root of 28368321 is about 304.9845768426.

The spelling of 28368321 in words is "twenty-eight million, three hundred sixty-eight thousand, three hundred twenty-one".