8120721760 has 48 divisors (see below), whose sum is σ = 19228104000. Its totient is φ = 3241025536.

The previous prime is 8120721737. The next prime is 8120721761. The reversal of 8120721760 is 671270218.

It is a happy number.

It is a super-2 number, since 2×8120721760² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120721761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15321 + ... + 128359.

It is an arithmetic number, because the mean of its divisors is an integer number (400585500).

Almost surely, 2^8120721760 is an apocalyptic number.

8120721760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8120721760 is an abundant number, since it is smaller than the sum of its proper divisors (11107382240).

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

8120721760 is a wasteful number, since it uses less digits than its factorization.

8120721760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113503 (or 113495 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 34.

The square root of 8120721760 is about 90115.0473561436. The cubic root of 8120721760 is about 2010.0099634004.

Adding to 8120721760 its reverse (671270218), we get a palindrome (8791991978).

The spelling of 8120721760 in words is "eight billion, one hundred twenty million, seven hundred twenty-one thousand, seven hundred sixty".