64523309 has 8 divisors (see below), whose sum is σ = 66173760. Its totient is φ = 62893600.

The previous prime is 64523293. The next prime is 64523311. The reversal of 64523309 is 90332546.

64523309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64523309 - 2⁴ = 64523293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64523359) 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 in 7 ways as a sum of consecutive naturals, for example, 1214 + ... + 11424.

It is an arithmetic number, because the mean of its divisors is an integer number (8271720).

Almost surely, 2^64523309 is an apocalyptic number.

It is an amenable number.

64523309 is a deficient number, since it is larger than the sum of its proper divisors (1650451).

64523309 is a wasteful number, since it uses less digits than its factorization.

64523309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10371.

The product of its (nonzero) digits is 19440, while the sum is 32.

The square root of 64523309 is about 8032.6402259780. The cubic root of 64523309 is about 401.0872690208.

The spelling of 64523309 in words is "sixty-four million, five hundred twenty-three thousand, three hundred nine".