9720645219 has 16 divisors (see below), whose sum is σ = 14615898240. Its totient is φ = 6383706120.

The previous prime is 9720645211. The next prime is 9720645247. The reversal of 9720645219 is 9125460279.

It is not a de Polignac number, because 9720645219 - 2³ = 9720645211 is a prime.

It is a super-2 number, since 2×9720645219² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9720645211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2684937 + ... + 2688554.

It is an arithmetic number, because the mean of its divisors is an integer number (913493640).

Almost surely, 2^9720645219 is an apocalyptic number.

9720645219 is a deficient number, since it is larger than the sum of its proper divisors (4895253021).

9720645219 is a wasteful number, since it uses less digits than its factorization.

9720645219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5373567 (or 5373561 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 9720645219 is about 98593.3325281177. The cubic root of 9720645219 is about 2134.1832033599.

The spelling of 9720645219 in words is "nine billion, seven hundred twenty million, six hundred forty-five thousand, two hundred nineteen".