3991065960 has 64 divisors (see below), whose sum is σ = 13683657600. Its totient is φ = 912243456.

The previous prime is 3991065907. The next prime is 3991065989. The reversal of 3991065960 is 695601993.

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, 2374795 + ... + 2376474.

It is an arithmetic number, because the mean of its divisors is an integer number (213807150).

Almost surely, 2^3991065960 is an apocalyptic number.

3991065960 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3991065960 is an abundant number, since it is smaller than the sum of its proper divisors (9692591640).

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

3991065960 is a wasteful number, since it uses less digits than its factorization.

3991065960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4751290 (or 4751286 counting only the distinct ones).

The product of its (nonzero) digits is 393660, while the sum is 48.

The square root of 3991065960 is about 63174.8839334114. The cubic root of 3991065960 is about 1586.2183456273.

The spelling of 3991065960 in words is "three billion, nine hundred ninety-one million, sixty-five thousand, nine hundred sixty".