28443305 has 8 divisors (see below), whose sum is σ = 37234944. Its totient is φ = 20686000.

The previous prime is 28443281. The next prime is 28443307. The reversal of 28443305 is 50334482.

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

It is not a de Polignac number, because 28443305 - 2⁶ = 28443241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28443307) 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, 258521 + ... + 258630.

It is an arithmetic number, because the mean of its divisors is an integer number (4654368).

Almost surely, 2^28443305 is an apocalyptic number.

It is an amenable number.

28443305 is a deficient number, since it is larger than the sum of its proper divisors (8791639).

28443305 is a wasteful number, since it uses less digits than its factorization.

28443305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517167.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 28443305 is about 5333.2265093469. The cubic root of 28443305 is about 305.2530552360.

Adding to 28443305 its reverse (50334482), we get a palindrome (78777787).

The spelling of 28443305 in words is "twenty-eight million, four hundred forty-three thousand, three hundred five".