28555871 has 2 divisors, whose sum is σ = 28555872. Its totient is φ = 28555870.

The previous prime is 28555843. The next prime is 28555873. The reversal of 28555871 is 17855582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28555871 - 2¹⁰ = 28554847 is a prime.

Together with 28555873, 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 (28555873) 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, 14277935 + 14277936.

It is an arithmetic number, because the mean of its divisors is an integer number (14277936).

Almost surely, 2^28555871 is an apocalyptic number.

28555871 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555871 is an equidigital number, since it uses as much as digits as its factorization.

28555871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112000, while the sum is 41.

The square root of 28555871 is about 5343.7693625380. The cubic root of 28555871 is about 305.6552106363.

The spelling of 28555871 in words is "twenty-eight million, five hundred fifty-five thousand, eight hundred seventy-one".