9640385864 has 8 divisors (see below), whose sum is σ = 18075723510. Its totient is φ = 4820192928.

The previous prime is 9640385791. The next prime is 9640385873. The reversal of 9640385864 is 4685830469.

9640385864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 8613696100 + 1026689764 = 92810^2 + 32042^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×9640385864² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 602524109 + ... + 602524124.

Almost surely, 2^9640385864 is an apocalyptic number.

It is an amenable number.

9640385864 is a deficient number, since it is larger than the sum of its proper divisors (8435337646).

9640385864 is a wasteful number, since it uses less digits than its factorization.

9640385864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205048239 (or 1205048235 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 53.

The square root of 9640385864 is about 98185.4666638602. The cubic root of 9640385864 is about 2128.2932733393.

The spelling of 9640385864 in words is "nine billion, six hundred forty million, three hundred eighty-five thousand, eight hundred sixty-four".