3959881728 has 136 divisors (see below), whose sum is σ = 11525859456. Its totient is φ = 1199308800.

The previous prime is 3959881711. The next prime is 3959881753. The reversal of 3959881728 is 8271889593.

It is a congruent number.

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, 2161773 + ... + 2163603.

Almost surely, 2^3959881728 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 3959881728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5762929728).

3959881728 is an abundant number, since it is smaller than the sum of its proper divisors (7565977728).

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

3959881728 is an equidigital number, since it uses as much as digits as its factorization.

3959881728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1847 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 60.

The square root of 3959881728 is about 62927.5911504644. The cubic root of 3959881728 is about 1582.0762279316.

The spelling of 3959881728 in words is "three billion, nine hundred fifty-nine million, eight hundred eighty-one thousand, seven hundred twenty-eight".