28459009 has 2 divisors, whose sum is σ = 28459010. Its totient is φ = 28459008.

The previous prime is 28458973. The next prime is 28459021. The reversal of 28459009 is 90095482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21594609 + 6864400 = 4647^2 + 2620^2 .

It is a cyclic number.

It is not a de Polignac number, because 28459009 - 2¹⁹ = 27934721 is a prime.

It is not a weakly prime, because it can be changed into another prime (28459069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14229504 + 14229505.

It is an arithmetic number, because the mean of its divisors is an integer number (14229505).

It is a Proth number, since it is equal to 1737 ⋅ 2¹⁴ + 1 and 1737 < 2¹⁴.

Almost surely, 2^28459009 is an apocalyptic number.

It is an amenable number.

28459009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28459009 is an equidigital number, since it uses as much as digits as its factorization.

28459009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28459009 is about 5334.6985856747. The cubic root of 28459009 is about 305.3092232519.

The spelling of 28459009 in words is "twenty-eight million, four hundred fifty-nine thousand, nine".