28526209 has 2 divisors, whose sum is σ = 28526210. Its totient is φ = 28526208.

The previous prime is 28526203. The next prime is 28526249. The reversal of 28526209 is 90262582.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28515600 + 10609 = 5340^2 + 103^2 .

It is a cyclic number.

It is not a de Polignac number, because 28526209 - 2⁷ = 28526081 is a prime.

It is not a weakly prime, because it can be changed into another prime (28526203) 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, 14263104 + 14263105.

It is an arithmetic number, because the mean of its divisors is an integer number (14263105).

Almost surely, 2^28526209 is an apocalyptic number.

It is an amenable number.

28526209 is a deficient number, since it is larger than the sum of its proper divisors (1).

28526209 is an equidigital number, since it uses as much as digits as its factorization.

28526209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 28526209 is about 5340.9932596849. The cubic root of 28526209 is about 305.5493423212.

The spelling of 28526209 in words is "twenty-eight million, five hundred twenty-six thousand, two hundred nine".