28569839 has 2 divisors, whose sum is σ = 28569840. Its totient is φ = 28569838.

The previous prime is 28569829. The next prime is 28569847. The reversal of 28569839 is 93896582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28569839 - 2⁴ = 28569823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28569829) 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 as a sum of consecutive naturals, namely, 14284919 + 14284920.

It is an arithmetic number, because the mean of its divisors is an integer number (14284920).

Almost surely, 2^28569839 is an apocalyptic number.

28569839 is a deficient number, since it is larger than the sum of its proper divisors (1).

28569839 is an equidigital number, since it uses as much as digits as its factorization.

28569839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 933120, while the sum is 50.

The square root of 28569839 is about 5345.0761453884. The cubic root of 28569839 is about 305.7050392226.

The spelling of 28569839 in words is "twenty-eight million, five hundred sixty-nine thousand, eight hundred thirty-nine".