9881929728 has 576 divisors, whose sum is σ = 34220309760. Its totient is φ = 2713190400.

The previous prime is 9881929723. The next prime is 9881929741. The reversal of 9881929728 is 8279291889.

It is a tau number, because it is divible by the number of its divisors (576).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9881929721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 161998818 + ... + 161998878.

It is an arithmetic number, because the mean of its divisors is an integer number (59410260).

Almost surely, 2^9881929728 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 9881929728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17110154880).

9881929728 is an abundant number, since it is smaller than the sum of its proper divisors (24338380032).

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

9881929728 is a wasteful number, since it uses less digits than its factorization.

9881929728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 141 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 63.

The square root of 9881929728 is about 99407.8957025044. The cubic root of 9881929728 is about 2145.9219418583.

The spelling of 9881929728 in words is "nine billion, eight hundred eighty-one million, nine hundred twenty-nine thousand, seven hundred twenty-eight".