9929730820 has 24 divisors (see below), whose sum is σ = 20887272000. Its totient is φ = 3965256672.

The previous prime is 9929730791. The next prime is 9929730827. The reversal of 9929730820 is 280379299.

It is not an unprimeable number, because it can be changed into a prime (9929730827) 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, 402450 + ... + 426409.

It is an arithmetic number, because the mean of its divisors is an integer number (870303000).

Almost surely, 2^9929730820 is an apocalyptic number.

It is an amenable number.

9929730820 is an abundant number, since it is smaller than the sum of its proper divisors (10957541180).

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

9929730820 is a wasteful number, since it uses less digits than its factorization.

9929730820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829467 (or 829465 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 49.

The square root of 9929730820 is about 99648.0347021455. The cubic root of 9929730820 is about 2149.3764782849.

The spelling of 9929730820 in words is "nine billion, nine hundred twenty-nine million, seven hundred thirty thousand, eight hundred twenty".