9791999568 has 120 divisors (see below), whose sum is σ = 29700864648. Its totient is φ = 2993642496.

The previous prime is 9791999561. The next prime is 9791999573. The reversal of 9791999568 is 8659991979.

It can be written as a sum of positive squares in 4 ways, for example, as 501264 + 9791498304 = 708^2 + 98952^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a junction number, because it is equal to n+sod(n) for n = 9791999496 and 9791999505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9791999561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277246 + ... + 310562.

It is a vampire number, since it can be written as 97968 ⋅ 99951 (with its own digits).

Almost surely, 2^9791999568 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 9791999568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14850432324).

9791999568 is an abundant number, since it is smaller than the sum of its proper divisors (19908865080).

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

9791999568 is a wasteful number, since it uses less digits than its factorization.

9791999568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33501 (or 33492 counting only the distinct ones).

The product of its digits is 99202320, while the sum is 72.

The square root of 9791999568 is about 98954.5328320032. The cubic root of 9791999568 is about 2139.3924650341.

The spelling of 9791999568 in words is "nine billion, seven hundred ninety-one million, nine hundred ninety-nine thousand, five hundred sixty-eight".