8320721760 has 720 divisors, whose sum is σ = 33145413840. Its totient is φ = 1962455040.

The previous prime is 8320721713. The next prime is 8320721771. The reversal of 8320721760 is 671270238.

It is a tau number, because it is divible by the number of its divisors (720).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 63516895 + ... + 63517025.

It is an arithmetic number, because the mean of its divisors is an integer number (46035297).

Almost surely, 2^8320721760 is an apocalyptic number.

8320721760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8320721760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16572706920).

8320721760 is an abundant number, since it is smaller than the sum of its proper divisors (24824692080).

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

8320721760 is a wasteful number, since it uses less digits than its factorization.

8320721760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 183 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 36.

The square root of 8320721760 is about 91217.9903308552. The cubic root of 8320721760 is about 2026.3774003316.

Adding to 8320721760 its reverse (671270238), we get a palindrome (8991991998).

The spelling of 8320721760 in words is "eight billion, three hundred twenty million, seven hundred twenty-one thousand, seven hundred sixty".