9161720368 has 60 divisors (see below), whose sum is σ = 18873948240. Its totient is φ = 4303063296.

The previous prime is 9161720363. The next prime is 9161720389. The reversal of 9161720368 is 8630271619.

It is not an unprimeable number, because it can be changed into a prime (9161720363) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 628005 + ... + 642427.

It is an arithmetic number, because the mean of its divisors is an integer number (314565804).

Almost surely, 2^9161720368 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 9161720368, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9436974120).

9161720368 is an abundant number, since it is smaller than the sum of its proper divisors (9712227872).

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

9161720368 is a wasteful number, since it uses less digits than its factorization.

9161720368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14534 (or 14491 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 9161720368 is about 95716.8760877621. The cubic root of 9161720368 is about 2092.4688945263.

The spelling of 9161720368 in words is "nine billion, one hundred sixty-one million, seven hundred twenty thousand, three hundred sixty-eight".