9891768832 has 80 divisors (see below), whose sum is σ = 21643864704. Its totient is φ = 4478976000.

The previous prime is 9891768797. The next prime is 9891768851. The reversal of 9891768832 is 2388671989.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1523032 + ... + 1529512.

Almost surely, 2^9891768832 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 9891768832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10821932352).

9891768832 is an abundant number, since it is smaller than the sum of its proper divisors (11752095872).

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

9891768832 is a wasteful number, since it uses less digits than its factorization.

9891768832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6781 (or 6765 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 61.

The square root of 9891768832 is about 99457.3719339095. The cubic root of 9891768832 is about 2146.6339129724.

The spelling of 9891768832 in words is "nine billion, eight hundred ninety-one million, seven hundred sixty-eight thousand, eight hundred thirty-two".