28165443 has 4 divisors (see below), whose sum is σ = 37553928. Its totient is φ = 18776960.

The previous prime is 28165441. The next prime is 28165457. The reversal of 28165443 is 34456182.

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 28165443 - 2¹ = 28165441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28165441) 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 3 ways as a sum of consecutive naturals, for example, 4694238 + ... + 4694243.

It is an arithmetic number, because the mean of its divisors is an integer number (9388482).

Almost surely, 2^28165443 is an apocalyptic number.

28165443 is a deficient number, since it is larger than the sum of its proper divisors (9388485).

28165443 is an equidigital number, since it uses as much as digits as its factorization.

28165443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9388484.

The product of its digits is 23040, while the sum is 33.

The square root of 28165443 is about 5307.1124917416. The cubic root of 28165443 is about 304.2557973692.

The spelling of 28165443 in words is "twenty-eight million, one hundred sixty-five thousand, four hundred forty-three".