3981816608 has 96 divisors (see below), whose sum is σ = 9789050880. Its totient is φ = 1548898560.

The previous prime is 3981816593. The next prime is 3981816611. The reversal of 3981816608 is 8066181893.

It is a happy number.

3981816608 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 15 ways as a sum of consecutive naturals, for example, 2766353 + ... + 2767791.

It is an arithmetic number, because the mean of its divisors is an integer number (101969280).

Almost surely, 2^3981816608 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 3981816608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4894525440).

3981816608 is an abundant number, since it is smaller than the sum of its proper divisors (5807234272).

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

3981816608 is a wasteful number, since it uses less digits than its factorization.

3981816608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2590 (or 2582 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 3981816608 is about 63101.6371261475. The cubic root of 3981816608 is about 1584.9920366340.

The spelling of 3981816608 in words is "three billion, nine hundred eighty-one million, eight hundred sixteen thousand, six hundred eight".