9721997752 has 32 divisors (see below), whose sum is σ = 19119769920. Its totient is φ = 4628983680.

The previous prime is 9721997717. The next prime is 9721997759. The reversal of 9721997752 is 2577991279.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9721997759) 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, 335499 + ... + 363322.

It is an arithmetic number, because the mean of its divisors is an integer number (597492810).

Almost surely, 2^9721997752 is an apocalyptic number.

It is an amenable number.

9721997752 is a deficient number, since it is larger than the sum of its proper divisors (9397772168).

9721997752 is a wasteful number, since it uses less digits than its factorization.

9721997752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 698911 (or 698907 counting only the distinct ones).

The product of its digits is 5000940, while the sum is 58.

The square root of 9721997752 is about 98600.1914399764. The cubic root of 9721997752 is about 2134.2821823638.

The spelling of 9721997752 in words is "nine billion, seven hundred twenty-one million, nine hundred ninety-seven thousand, seven hundred fifty-two".