8171720352 has 72 divisors (see below), whose sum is σ = 23288900544. Its totient is φ = 2717979264.

The previous prime is 8171720321. The next prime is 8171720353. The reversal of 8171720352 is 2530271718.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×8171720352² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (8171720353) 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, 102703 + ... + 163985.

It is an arithmetic number, because the mean of its divisors is an integer number (323456952).

Almost surely, 2^8171720352 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 8171720352, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11644450272).

8171720352 is an abundant number, since it is smaller than the sum of its proper divisors (15117180192).

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

8171720352 is a wasteful number, since it uses less digits than its factorization.

8171720352 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61762 (or 61751 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 8171720352 is about 90397.5682858781. The cubic root of 8171720352 is about 2014.2088446468.

The spelling of 8171720352 in words is "eight billion, one hundred seventy-one million, seven hundred twenty thousand, three hundred fifty-two".