64536809 has 2 divisors, whose sum is σ = 64536810. Its totient is φ = 64536808.

The previous prime is 64536793. The next prime is 64536877. The reversal of 64536809 is 90863546.

64536809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47955625 + 16581184 = 6925^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 64536809 - 2⁴ = 64536793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64536509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32268404 + 32268405.

It is an arithmetic number, because the mean of its divisors is an integer number (32268405).

Almost surely, 2^64536809 is an apocalyptic number.

It is an amenable number.

64536809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64536809 is an equidigital number, since it uses as much as digits as its factorization.

64536809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 64536809 is about 8033.4805034929. The cubic root of 64536809 is about 401.1152397941.

The spelling of 64536809 in words is "sixty-four million, five hundred thirty-six thousand, eight hundred nine".