28305321 has 8 divisors (see below), whose sum is σ = 41171424. Its totient is φ = 17154720.

The previous prime is 28305313. The next prime is 28305349. The reversal of 28305321 is 12350382.

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

It is not a de Polignac number, because 28305321 - 2³ = 28305313 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28305291 and 28305300.

It is not an unprimeable number, because it can be changed into a prime (28305371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428836 + ... + 428901.

It is an arithmetic number, because the mean of its divisors is an integer number (5146428).

Almost surely, 2^28305321 is an apocalyptic number.

It is an amenable number.

28305321 is a deficient number, since it is larger than the sum of its proper divisors (12866103).

28305321 is a wasteful number, since it uses less digits than its factorization.

28305321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857751.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 28305321 is about 5320.2745229922. The cubic root of 28305321 is about 304.7586409082.

The spelling of 28305321 in words is "twenty-eight million, three hundred five thousand, three hundred twenty-one".