64320065 has 4 divisors (see below), whose sum is σ = 77184084. Its totient is φ = 51456048.

The previous prime is 64320041. The next prime is 64320077. The reversal of 64320065 is 56002346.

64320065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 41576704 + 22743361 = 6448^2 + 4769^2 .

It is a cyclic number.

It is not a de Polignac number, because 64320065 - 2⁶ = 64320001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6432002 + ... + 6432011.

It is an arithmetic number, because the mean of its divisors is an integer number (19296021).

Almost surely, 2^64320065 is an apocalyptic number.

It is an amenable number.

64320065 is a deficient number, since it is larger than the sum of its proper divisors (12864019).

64320065 is a wasteful number, since it uses less digits than its factorization.

64320065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12864018.

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 64320065 is about 8019.9791146860. The cubic root of 64320065 is about 400.6656935988.

The spelling of 64320065 in words is "sixty-four million, three hundred twenty thousand, sixty-five".