64568717 has 4 divisors (see below), whose sum is σ = 64649340. Its totient is φ = 64488096.

The previous prime is 64568689. The next prime is 64568723. The reversal of 64568717 is 71786546.

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 61011721 + 3556996 = 7811^2 + 1886^2 .

It is a cyclic number.

It is not a de Polignac number, because 64568717 - 2¹⁴ = 64552333 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 (64568417) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39098 + ... + 40715.

It is an arithmetic number, because the mean of its divisors is an integer number (16162335).

Almost surely, 2^64568717 is an apocalyptic number.

It is an amenable number.

64568717 is a deficient number, since it is larger than the sum of its proper divisors (80623).

64568717 is an equidigital number, since it uses as much as digits as its factorization.

64568717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80622.

The product of its digits is 282240, while the sum is 44.

The square root of 64568717 is about 8035.4661968053. The cubic root of 64568717 is about 401.1813347691.

The spelling of 64568717 in words is "sixty-four million, five hundred sixty-eight thousand, seven hundred seventeen".