9721962720 has 288 divisors, whose sum is σ = 35249891040. Its totient is φ = 2431549440.

The previous prime is 9721962689. The next prime is 9721962773. The reversal of 9721962720 is 272691279.

9721962720 is a `hidden beast` number, since 9 + 7 + 2 + 19 + 627 + 2 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10011835 + ... + 10012805.

It is an arithmetic number, because the mean of its divisors is an integer number (122395455).

Almost surely, 2^9721962720 is an apocalyptic number.

9721962720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9721962720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17624945520).

9721962720 is an abundant number, since it is smaller than the sum of its proper divisors (25527928320).

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

9721962720 is a wasteful number, since it uses less digits than its factorization.

9721962720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1418 (or 1407 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 9721962720 is about 98600.0137931025. The cubic root of 9721962720 is about 2134.2796188213.

The spelling of 9721962720 in words is "nine billion, seven hundred twenty-one million, nine hundred sixty-two thousand, seven hundred twenty".