28805519 has 2 divisors, whose sum is σ = 28805520. Its totient is φ = 28805518.

The previous prime is 28805489. The next prime is 28805521. The reversal of 28805519 is 91550882.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28805519 is a prime.

It is a super-2 number, since 2×28805519² = 1659515849718722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 28805521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28805419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14402759 + 14402760.

It is an arithmetic number, because the mean of its divisors is an integer number (14402760).

Almost surely, 2^28805519 is an apocalyptic number.

28805519 is a deficient number, since it is larger than the sum of its proper divisors (1).

28805519 is an equidigital number, since it uses as much as digits as its factorization.

28805519 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28800, while the sum is 38.

The square root of 28805519 is about 5367.0773238328. The cubic root of 28805519 is about 306.5433516224.

The spelling of 28805519 in words is "twenty-eight million, eight hundred five thousand, five hundred nineteen".