6399128384 has 56 divisors (see below), whose sum is σ = 14079845856. Its totient is φ = 2860992000.

The previous prime is 6399128383. The next prime is 6399128413. The reversal of 6399128384 is 4838219936.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6399128383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31562 + ... + 117449.

Almost surely, 2^6399128384 is an apocalyptic number.

6399128384 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6399128384 is an abundant number, since it is smaller than the sum of its proper divisors (7680717472).

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

6399128384 is a wasteful number, since it uses less digits than its factorization.

6399128384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149095 (or 149085 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 53.

The square root of 6399128384 is about 79994.5522145102. The cubic root of 6399128384 is about 1856.5512445541.

The spelling of 6399128384 in words is "six billion, three hundred ninety-nine million, one hundred twenty-eight thousand, three hundred eighty-four".