6504640389 has 64 divisors (see below), whose sum is σ = 10586822400. Its totient is φ = 3922732800.

The previous prime is 6504640381. The next prime is 6504640391. The reversal of 6504640389 is 9830464056.

6504640389 is a `hidden beast` number, since 6 + 504 + 64 + 0 + 3 + 89 = 666.

It is not a de Polignac number, because 6504640389 - 2³ = 6504640381 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

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

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9870142 + ... + 9870800.

It is an arithmetic number, because the mean of its divisors is an integer number (165419100).

Almost surely, 2^6504640389 is an apocalyptic number.

It is an amenable number.

6504640389 is a deficient number, since it is larger than the sum of its proper divisors (4082182011).

6504640389 is a wasteful number, since it uses less digits than its factorization.

6504640389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1203 (or 1197 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The square root of 6504640389 is about 80651.3508194376. The cubic root of 6504640389 is about 1866.6995831178.

The spelling of 6504640389 in words is "six billion, five hundred four million, six hundred forty thousand, three hundred eighty-nine".