9721324788 has 48 divisors (see below), whose sum is σ = 25930283904. Its totient is φ = 2776798080.

The previous prime is 9721324777. The next prime is 9721324861. The reversal of 9721324788 is 8874231279.

It is a self number, because there is not a number n which added to its sum of digits gives 9721324788.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 366618 + ... + 392238.

It is an arithmetic number, because the mean of its divisors is an integer number (540214248).

Almost surely, 2^9721324788 is an apocalyptic number.

It is an amenable number.

9721324788 is an abundant number, since it is smaller than the sum of its proper divisors (16208959116).

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

9721324788 is a wasteful number, since it uses less digits than its factorization.

9721324788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30152 (or 30150 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 51.

The square root of 9721324788 is about 98596.7787911958. The cubic root of 9721324788 is about 2134.2329356879.

The spelling of 9721324788 in words is "nine billion, seven hundred twenty-one million, three hundred twenty-four thousand, seven hundred eighty-eight".