3991589664 has 48 divisors (see below), whose sum is σ = 11094275808. Its totient is φ = 1252262912.

The previous prime is 3991589663. The next prime is 3991589669. The reversal of 3991589664 is 4669851993.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 3991589598 and 3991589607.

It is not an unprimeable number, because it can be changed into a prime (3991589663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1221282 + ... + 1224545.

It is an arithmetic number, because the mean of its divisors is an integer number (231130746).

Almost surely, 2^3991589664 is an apocalyptic number.

3991589664 is a gapful number since it is divisible by the number (34) formed by its first and last digit.

It is an amenable number.

3991589664 is an abundant number, since it is smaller than the sum of its proper divisors (7102686144).

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

3991589664 is a wasteful number, since it uses less digits than its factorization.

3991589664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2445857 (or 2445849 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 60.

The square root of 3991589664 is about 63179.0286724954. The cubic root of 3991589664 is about 1586.2877232964.

The spelling of 3991589664 in words is "three billion, nine hundred ninety-one million, five hundred eighty-nine thousand, six hundred sixty-four".