3981720680 has 32 divisors (see below), whose sum is σ = 10238711040. Its totient is φ = 1365161280.

The previous prime is 3981720643. The next prime is 3981720709. The reversal of 3981720680 is 860271893.

3981720680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7109936 + ... + 7110495.

It is an arithmetic number, because the mean of its divisors is an integer number (319959720).

Almost surely, 2^3981720680 is an apocalyptic number.

It is an amenable number.

3981720680 is an abundant number, since it is smaller than the sum of its proper divisors (6256990360).

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

3981720680 is a wasteful number, since it uses less digits than its factorization.

3981720680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14220449 (or 14220445 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 44.

The square root of 3981720680 is about 63100.8770145075. The cubic root of 3981720680 is about 1584.9793082446.

The spelling of 3981720680 in words is "three billion, nine hundred eighty-one million, seven hundred twenty thousand, six hundred eighty".