6384640 has 88 divisors (see below), whose sum is σ = 16212240. Its totient is φ = 2408448.

The previous prime is 6384629. The next prime is 6384647. The reversal of 6384640 is 464836.

It is not an unprimeable number, because it can be changed into a prime (6384647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148459 + ... + 148501.

It is an arithmetic number, because the mean of its divisors is an integer number (184230).

Almost surely, 2^6384640 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 6384640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8106120).

6384640 is an abundant number, since it is smaller than the sum of its proper divisors (9827600).

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

6384640 is a wasteful number, since it uses less digits than its factorization.

6384640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 79 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 6384640 is about 2526.7845179200. The cubic root of 6384640 is about 185.5149035185.

The spelling of 6384640 in words is "six million, three hundred eighty-four thousand, six hundred forty".