64463209 has 2 divisors, whose sum is σ = 64463210. Its totient is φ = 64463208.

The previous prime is 64463207. The next prime is 64463221. The reversal of 64463209 is 90236446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37454400 + 27008809 = 6120^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 64463209 - 2¹ = 64463207 is a prime.

Together with 64463207, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (64463207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32231604 + 32231605.

It is an arithmetic number, because the mean of its divisors is an integer number (32231605).

Almost surely, 2^64463209 is an apocalyptic number.

It is an amenable number.

64463209 is a deficient number, since it is larger than the sum of its proper divisors (1).

64463209 is an equidigital number, since it uses as much as digits as its factorization.

64463209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 64463209 is about 8028.8983677713. The cubic root of 64463209 is about 400.9626999134.

The spelling of 64463209 in words is "sixty-four million, four hundred sixty-three thousand, two hundred nine".