28564441 has 4 divisors (see below), whose sum is σ = 28579300. Its totient is φ = 28549584.

The previous prime is 28564421. The next prime is 28564447. The reversal of 28564441 is 14446582.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1742400 + 26822041 = 1320^2 + 5179^2 .

It is a cyclic number.

It is not a de Polignac number, because 28564441 - 2⁷ = 28564313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28564397 and 28564406.

It is not an unprimeable number, because it can be changed into a prime (28564447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4026 + ... + 8563.

It is an arithmetic number, because the mean of its divisors is an integer number (7144825).

Almost surely, 2^28564441 is an apocalyptic number.

It is an amenable number.

28564441 is a deficient number, since it is larger than the sum of its proper divisors (14859).

28564441 is a wasteful number, since it uses less digits than its factorization.

28564441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14858.

The product of its digits is 30720, while the sum is 34.

The square root of 28564441 is about 5344.5711708237. The cubic root of 28564441 is about 305.6857846544.

The spelling of 28564441 in words is "twenty-eight million, five hundred sixty-four thousand, four hundred forty-one".