64665576 has 24 divisors (see below), whose sum is σ = 175136130. Its totient is φ = 21555168.

The previous prime is 64665571. The next prime is 64665577. The reversal of 64665576 is 67556646.

It can be written as a sum of positive squares in only one way, i.e., 41912676 + 22752900 = 6474^2 + 4770^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (64665571) 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 5 ways as a sum of consecutive naturals, for example, 448995 + ... + 449138.

Almost surely, 2^64665576 is an apocalyptic number.

It is an amenable number.

64665576 is an abundant number, since it is smaller than the sum of its proper divisors (110470554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64665576 is a wasteful number, since it uses less digits than its factorization.

64665576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 898145 (or 898138 counting only the distinct ones).

The product of its digits is 907200, while the sum is 45.

The square root of 64665576 is about 8041.4909065421. The cubic root of 64665576 is about 401.3818374825.

The spelling of 64665576 in words is "sixty-four million, six hundred sixty-five thousand, five hundred seventy-six".