9729697920 has 64 divisors (see below), whose sum is σ = 31013418240. Its totient is φ = 2594585600.

The previous prime is 9729697883. The next prime is 9729697921. The reversal of 9729697920 is 297969279.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×9729697920² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (9729697921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2531856 + ... + 2535695.

It is an arithmetic number, because the mean of its divisors is an integer number (484584660).

Almost surely, 2^9729697920 is an apocalyptic number.

It is an amenable number.

9729697920 is an abundant number, since it is smaller than the sum of its proper divisors (21283720320).

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

9729697920 is a wasteful number, since it uses less digits than its factorization.

9729697920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5067573 (or 5067561 counting only the distinct ones).

The product of its (nonzero) digits is 7715736, while the sum is 60.

The square root of 9729697920 is about 98639.2311405558. The cubic root of 9729697920 is about 2134.8455094643.

The spelling of 9729697920 in words is "nine billion, seven hundred twenty-nine million, six hundred ninety-seven thousand, nine hundred twenty".