9945725720 has 32 divisors (see below), whose sum is σ = 25574724000. Its totient is φ = 3409963008.

The previous prime is 9945725707. The next prime is 9945725723. The reversal of 9945725720 is 275275499.

9945725720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9945725723) 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, 17759945 + ... + 17760504.

It is an arithmetic number, because the mean of its divisors is an integer number (799210125).

Almost surely, 2^9945725720 is an apocalyptic number.

It is an amenable number.

9945725720 is an abundant number, since it is smaller than the sum of its proper divisors (15628998280).

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

9945725720 is a wasteful number, since it uses less digits than its factorization.

9945725720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35520467 (or 35520463 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 50.

The square root of 9945725720 is about 99728.2593851913. The cubic root of 9945725720 is about 2150.5299375139.

The spelling of 9945725720 in words is "nine billion, nine hundred forty-five million, seven hundred twenty-five thousand, seven hundred twenty".