9720911980 has 96 divisors (see below), whose sum is σ = 22512168000. Its totient is φ = 3503920128.

The previous prime is 9720911971. The next prime is 9720912023. The reversal of 9720911980 is 891190279.

It is a happy number.

It is a super-2 number, since 2×9720911980² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 9720911980.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2283534 + ... + 2287786.

It is an arithmetic number, because the mean of its divisors is an integer number (234501750).

Almost surely, 2^9720911980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9720911980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11256084000).

9720911980 is an abundant number, since it is smaller than the sum of its proper divisors (12791256020).

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

9720911980 is a wasteful number, since it uses less digits than its factorization.

9720911980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4483 (or 4481 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 46.

The square root of 9720911980 is about 98594.6853537248. The cubic root of 9720911980 is about 2134.2027257827.

The spelling of 9720911980 in words is "nine billion, seven hundred twenty million, nine hundred eleven thousand, nine hundred eighty".