9720685540 has 48 divisors (see below), whose sum is σ = 20504236032. Its totient is φ = 3871022976.

The previous prime is 9720685517. The next prime is 9720685549. The reversal of 9720685540 is 455860279.

9720685540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (9720685549) 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 15 ways as a sum of consecutive naturals, for example, 6717097 + ... + 6718543.

It is an arithmetic number, because the mean of its divisors is an integer number (427171584).

Almost surely, 2^9720685540 is an apocalyptic number.

It is an amenable number.

9720685540 is an abundant number, since it is smaller than the sum of its proper divisors (10783550492).

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

9720685540 is a wasteful number, since it uses less digits than its factorization.

9720685540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2716 (or 2714 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 9720685540 is about 98593.5370092787. The cubic root of 9720685540 is about 2134.1861542025.

The spelling of 9720685540 in words is "nine billion, seven hundred twenty million, six hundred eighty-five thousand, five hundred forty".