6441905688 has 32 divisors (see below), whose sum is σ = 16804972800. Its totient is φ = 2053940768.

The previous prime is 6441905669. The next prime is 6441905719. The reversal of 6441905688 is 8865091446.

It is a self number, because there is not a number n which added to its sum of digits gives 6441905688.

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, 5834508 + ... + 5835611.

It is an arithmetic number, because the mean of its divisors is an integer number (525155400).

Almost surely, 2^6441905688 is an apocalyptic number.

It is an amenable number.

6441905688 is an abundant number, since it is smaller than the sum of its proper divisors (10363067112).

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

6441905688 is a wasteful number, since it uses less digits than its factorization.

6441905688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11670151 (or 11670147 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 51.

The square root of 6441905688 is about 80261.4832157991. The cubic root of 6441905688 is about 1860.6789913231.

The spelling of 6441905688 in words is "six billion, four hundred forty-one million, nine hundred five thousand, six hundred eighty-eight".