64327609 has 4 divisors (see below), whose sum is σ = 68111604. Its totient is φ = 60543616.

The previous prime is 64327603. The next prime is 64327639. The reversal of 64327609 is 90672346.

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 35940025 + 28387584 = 5995^2 + 5328^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64327609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64327603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1891972 + ... + 1892005.

It is an arithmetic number, because the mean of its divisors is an integer number (17027901).

Almost surely, 2^64327609 is an apocalyptic number.

It is an amenable number.

64327609 is a deficient number, since it is larger than the sum of its proper divisors (3783995).

64327609 is a wasteful number, since it uses less digits than its factorization.

64327609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3783994.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 64327609 is about 8020.4494263102. The cubic root of 64327609 is about 400.6813574710.

It can be divided in two parts, 6432 and 7609, that added together give a palindrome (14041).

The spelling of 64327609 in words is "sixty-four million, three hundred twenty-seven thousand, six hundred nine".