6640344832 has 288 divisors, whose sum is σ = 16058972160. Its totient is φ = 2709504000.

The previous prime is 6640344829. The next prime is 6640344839. The reversal of 6640344832 is 2384430466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640344839) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108858082 + ... + 108858142.

It is an arithmetic number, because the mean of its divisors is an integer number (55760320).

Almost surely, 2^6640344832 is an apocalyptic number.

6640344832 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6640344832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8029486080).

6640344832 is an abundant number, since it is smaller than the sum of its proper divisors (9418627328).

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

6640344832 is a wasteful number, since it uses less digits than its factorization.

6640344832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 177 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 40.

The square root of 6640344832 is about 81488.3110145253. The cubic root of 6640344832 is about 1879.5918111836.

It can be divided in two parts, 664034 and 4832, that added together give a palindrome (668866).

The spelling of 6640344832 in words is "six billion, six hundred forty million, three hundred forty-four thousand, eight hundred thirty-two".