28064443 has 4 divisors (see below), whose sum is σ = 30615768. Its totient is φ = 25513120.

The previous prime is 28064441. The next prime is 28064447. The reversal of 28064443 is 34446082.

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 28064443 - 2¹ = 28064441 is a prime.

It is a super-2 number, since 2×28064443² = 1575225921800498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28064441) 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, 1275646 + ... + 1275667.

It is an arithmetic number, because the mean of its divisors is an integer number (7653942).

Almost surely, 2^28064443 is an apocalyptic number.

28064443 is a deficient number, since it is larger than the sum of its proper divisors (2551325).

28064443 is a wasteful number, since it uses less digits than its factorization.

28064443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551324.

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 28064443 is about 5297.5884136086. The cubic root of 28064443 is about 303.8916792923.

The spelling of 28064443 in words is "twenty-eight million, sixty-four thousand, four hundred forty-three".