28385443 has 4 divisors (see below), whose sum is σ = 28566400. Its totient is φ = 28204488.

The previous prime is 28385437. The next prime is 28385459. The reversal of 28385443 is 34458382.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28385443 - 2⁹ = 28384931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28385743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90243 + ... + 90556.

It is an arithmetic number, because the mean of its divisors is an integer number (7141600).

Almost surely, 2^28385443 is an apocalyptic number.

28385443 is a deficient number, since it is larger than the sum of its proper divisors (180957).

28385443 is a wasteful number, since it uses less digits than its factorization.

28385443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180956.

The product of its digits is 92160, while the sum is 37.

The square root of 28385443 is about 5327.7990765418. The cubic root of 28385443 is about 305.0459233905.

It can be divided in two parts, 2838 and 5443, that added together give a square (8281 = 91²).

The spelling of 28385443 in words is "twenty-eight million, three hundred eighty-five thousand, four hundred forty-three".