28044321 has 8 divisors (see below), whose sum is σ = 37599744. Its totient is φ = 18592560.

The previous prime is 28044319. The next prime is 28044343. The reversal of 28044321 is 12344082.

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

It is not a de Polignac number, because 28044321 - 2¹ = 28044319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28044291 and 28044300.

It is not an unprimeable number, because it can be changed into a prime (28044301) 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 7 ways as a sum of consecutive naturals, for example, 25281 + ... + 26366.

It is an arithmetic number, because the mean of its divisors is an integer number (4699968).

Almost surely, 2^28044321 is an apocalyptic number.

It is an amenable number.

28044321 is a deficient number, since it is larger than the sum of its proper divisors (9555423).

28044321 is a wasteful number, since it uses less digits than its factorization.

28044321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51831.

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 28044321 is about 5295.6889070262. The cubic root of 28044321 is about 303.8190325580.

The spelling of 28044321 in words is "twenty-eight million, forty-four thousand, three hundred twenty-one".