28575509 has 2 divisors, whose sum is σ = 28575510. Its totient is φ = 28575508.

The previous prime is 28575473. The next prime is 28575517. The reversal of 28575509 is 90557582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25502500 + 3073009 = 5050^2 + 1753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28575509 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28575409) 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, 14287754 + 14287755.

It is an arithmetic number, because the mean of its divisors is an integer number (14287755).

Almost surely, 2^28575509 is an apocalyptic number.

It is an amenable number.

28575509 is a deficient number, since it is larger than the sum of its proper divisors (1).

28575509 is an equidigital number, since it uses as much as digits as its factorization.

28575509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 41.

The square root of 28575509 is about 5345.6065137644. The cubic root of 28575509 is about 305.7252613984.

The spelling of 28575509 in words is "twenty-eight million, five hundred seventy-five thousand, five hundred nine".