6504640388 has 12 divisors (see below), whose sum is σ = 11625315072. Its totient is φ = 3183121800.

The previous prime is 6504640381. The next prime is 6504640391. The reversal of 6504640388 is 8830464056.

It is not an unprimeable number, because it can be changed into a prime (6504640381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17299388 + ... + 17299763.

It is an arithmetic number, because the mean of its divisors is an integer number (968776256).

Almost surely, 2^6504640388 is an apocalyptic number.

It is an amenable number.

6504640388 is a deficient number, since it is larger than the sum of its proper divisors (5120674684).

6504640388 is a wasteful number, since it uses less digits than its factorization.

6504640388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34599202 (or 34599200 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 44.

The square root of 6504640388 is about 80651.3508132381. The cubic root of 6504640388 is about 1866.6995830222.

The spelling of 6504640388 in words is "six billion, five hundred four million, six hundred forty thousand, three hundred eighty-eight".