64469809 has 2 divisors, whose sum is σ = 64469810. Its totient is φ = 64469808.

The previous prime is 64469791. The next prime is 64469819. The reversal of 64469809 is 90896446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64448784 + 21025 = 8028^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 64469809 - 2⁹ = 64469297 is a prime.

It is not a weakly prime, because it can be changed into another prime (64469819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32234904 + 32234905.

It is an arithmetic number, because the mean of its divisors is an integer number (32234905).

Almost surely, 2^64469809 is an apocalyptic number.

It is an amenable number.

64469809 is a deficient number, since it is larger than the sum of its proper divisors (1).

64469809 is an equidigital number, since it uses as much as digits as its factorization.

64469809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 64469809 is about 8029.3093725426. The cubic root of 64469809 is about 400.9763834990.

The spelling of 64469809 in words is "sixty-four million, four hundred sixty-nine thousand, eight hundred nine".