7720215680 has 64 divisors (see below), whose sum is σ = 18589132800. Its totient is φ = 3065834496.

The previous prime is 7720215677. The next prime is 7720215739. The reversal of 7720215680 is 865120277.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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, 45569 + ... + 132351.

It is an arithmetic number, because the mean of its divisors is an integer number (290455200).

Almost surely, 2^7720215680 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 7720215680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9294566400).

7720215680 is an abundant number, since it is smaller than the sum of its proper divisors (10868917120).

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

7720215680 is a wasteful number, since it uses less digits than its factorization.

7720215680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86941 (or 86929 counting only the distinct ones).

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

The square root of 7720215680 is about 87864.7578953018. The cubic root of 7720215680 is about 1976.4074296322.

The spelling of 7720215680 in words is "seven billion, seven hundred twenty million, two hundred fifteen thousand, six hundred eighty".