28305559 has 2 divisors, whose sum is σ = 28305560. Its totient is φ = 28305558.

The previous prime is 28305523. The next prime is 28305577. The reversal of 28305559 is 95550382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28305559 - 2²³ = 19916951 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28305359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14152779 + 14152780.

It is an arithmetic number, because the mean of its divisors is an integer number (14152780).

Almost surely, 2^28305559 is an apocalyptic number.

28305559 is a deficient number, since it is larger than the sum of its proper divisors (1).

28305559 is an equidigital number, since it uses as much as digits as its factorization.

28305559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54000, while the sum is 37.

The square root of 28305559 is about 5320.2968902120. The cubic root of 28305559 is about 304.7594950745.

The spelling of 28305559 in words is "twenty-eight million, three hundred five thousand, five hundred fifty-nine".