8520721760 has 96 divisors (see below), whose sum is σ = 21682805760. Its totient is φ = 3153765888.

The previous prime is 8520721757. The next prime is 8520721763. The reversal of 8520721760 is 671270258.

It is an interprime number because it is at equal distance from previous prime (8520721757) and next prime (8520721763).

It is a super-2 number, since 2×8520721760² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8520721763) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98129 + ... + 163311.

It is an arithmetic number, because the mean of its divisors is an integer number (225862560).

Almost surely, 2^8520721760 is an apocalyptic number.

8520721760 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 8520721760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10841402880).

8520721760 is an abundant number, since it is smaller than the sum of its proper divisors (13162084000).

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

8520721760 is a wasteful number, since it uses less digits than its factorization.

8520721760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65260 (or 65252 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 38.

The square root of 8520721760 is about 92307.7556871577. The cubic root of 8520721760 is about 2042.4846184072.

The spelling of 8520721760 in words is "eight billion, five hundred twenty million, seven hundred twenty-one thousand, seven hundred sixty".