9640391568 has 40 divisors (see below), whose sum is σ = 25204407648. Its totient is φ = 3174746112.

The previous prime is 9640391561. The next prime is 9640391581. The reversal of 9640391568 is 8651930469.

9640391568 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 9640391568.

It is not an unprimeable number, because it can be changed into a prime (9640391561) 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 7 ways as a sum of consecutive naturals, for example, 1205905 + ... + 1213872.

Almost surely, 2^9640391568 is an apocalyptic number.

It is an amenable number.

9640391568 is an abundant number, since it is smaller than the sum of its proper divisors (15564016080).

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

9640391568 is a wasteful number, since it uses less digits than its factorization.

9640391568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419871 (or 2419865 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The square root of 9640391568 is about 98185.4957109246. The cubic root of 9640391568 is about 2128.2936930937.

The spelling of 9640391568 in words is "nine billion, six hundred forty million, three hundred ninety-one thousand, five hundred sixty-eight".