28052809 has 2 divisors, whose sum is σ = 28052810. Its totient is φ = 28052808.

The previous prime is 28052807. The next prime is 28052819. The reversal of 28052809 is 90825082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22278400 + 5774409 = 4720^2 + 2403^2 .

It is a cyclic number.

It is not a de Polignac number, because 28052809 - 2¹ = 28052807 is a prime.

It is a super-3 number, since 3×28052809³ (a number of 23 digits) contains 333 as substring.

Together with 28052807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28052803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14026404 + 14026405.

It is an arithmetic number, because the mean of its divisors is an integer number (14026405).

Almost surely, 2^28052809 is an apocalyptic number.

It is an amenable number.

28052809 is a deficient number, since it is larger than the sum of its proper divisors (1).

28052809 is an equidigital number, since it uses as much as digits as its factorization.

28052809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28052809 is about 5296.4902529883. The cubic root of 28052809 is about 303.8496811377.

The spelling of 28052809 in words is "twenty-eight million, fifty-two thousand, eight hundred nine".