64073509 has 2 divisors, whose sum is σ = 64073510. Its totient is φ = 64073508.

The previous prime is 64073501. The next prime is 64073521. The reversal of 64073509 is 90537046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59985025 + 4088484 = 7745^2 + 2022^2 .

It is a cyclic number.

It is not a de Polignac number, because 64073509 - 2³ = 64073501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64073501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32036754 + 32036755.

It is an arithmetic number, because the mean of its divisors is an integer number (32036755).

Almost surely, 2^64073509 is an apocalyptic number.

It is an amenable number.

64073509 is a deficient number, since it is larger than the sum of its proper divisors (1).

64073509 is an equidigital number, since it uses as much as digits as its factorization.

64073509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 64073509 is about 8004.5929940254. The cubic root of 64073509 is about 400.1530851549.

The spelling of 64073509 in words is "sixty-four million, seventy-three thousand, five hundred nine".