6441879136 has 96 divisors (see below), whose sum is σ = 16071471360. Its totient is φ = 2468620800.

The previous prime is 6441879133. The next prime is 6441879161. The reversal of 6441879136 is 6319781446.

It is a self number, because there is not a number n which added to its sum of digits gives 6441879136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6441879133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128875 + ... + 171733.

It is an arithmetic number, because the mean of its divisors is an integer number (167411160).

Almost surely, 2^6441879136 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 6441879136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8035735680).

6441879136 is an abundant number, since it is smaller than the sum of its proper divisors (9629592224).

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

6441879136 is a wasteful number, since it uses less digits than its factorization.

6441879136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42948 (or 42940 counting only the distinct ones).

The product of its digits is 870912, while the sum is 49.

The square root of 6441879136 is about 80261.3178062758. The cubic root of 6441879136 is about 1860.6764348944.

The spelling of 6441879136 in words is "six billion, four hundred forty-one million, eight hundred seventy-nine thousand, one hundred thirty-six".