28240591 has 2 divisors, whose sum is σ = 28240592. Its totient is φ = 28240590.

The previous prime is 28240571. The next prime is 28240601. The reversal of 28240591 is 19504282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28240591 - 2⁵ = 28240559 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28240571) 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, 14120295 + 14120296.

It is an arithmetic number, because the mean of its divisors is an integer number (14120296).

Almost surely, 2^28240591 is an apocalyptic number.

28240591 is a deficient number, since it is larger than the sum of its proper divisors (1).

28240591 is an equidigital number, since it uses as much as digits as its factorization.

28240591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 28240591 is about 5314.1877083897. The cubic root of 28240591 is about 304.5261512462.

The spelling of 28240591 in words is "twenty-eight million, two hundred forty thousand, five hundred ninety-one".