64605709 has 16 divisors (see below), whose sum is σ = 76043520. Its totient is φ = 53735040.

The previous prime is 64605703. The next prime is 64605721. The reversal of 64605709 is 90750646.

It is a cyclic number.

It is not a de Polignac number, because 64605709 - 2³ = 64605701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64605701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65232 + ... + 66214.

It is an arithmetic number, because the mean of its divisors is an integer number (4752720).

Almost surely, 2^64605709 is an apocalyptic number.

It is an amenable number.

64605709 is a deficient number, since it is larger than the sum of its proper divisors (11437811).

64605709 is a wasteful number, since it uses less digits than its factorization.

64605709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1260.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 64605709 is about 8037.7676627283. The cubic root of 64605709 is about 401.2579336106.

The spelling of 64605709 in words is "sixty-four million, six hundred five thousand, seven hundred nine".