28582009 has 2 divisors, whose sum is σ = 28582010. Its totient is φ = 28582008.

The previous prime is 28582003. The next prime is 28582027. The reversal of 28582009 is 90028582.

28582009 is nontrivially palindromic in base 4.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24720784 + 3861225 = 4972^2 + 1965^2 .

It is a cyclic number.

It is not a de Polignac number, because 28582009 - 2¹³ = 28573817 is a prime.

It is not a weakly prime, because it can be changed into another prime (28582003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14291004 + 14291005.

It is an arithmetic number, because the mean of its divisors is an integer number (14291005).

Almost surely, 2^28582009 is an apocalyptic number.

It is an amenable number.

28582009 is a deficient number, since it is larger than the sum of its proper divisors (1).

28582009 is an equidigital number, since it uses as much as digits as its factorization.

28582009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 34.

The square root of 28582009 is about 5346.2144551075. The cubic root of 28582009 is about 305.7484404961.

The spelling of 28582009 in words is "twenty-eight million, five hundred eighty-two thousand, nine".