6438849872 has 40 divisors (see below), whose sum is σ = 15354183936. Its totient is φ = 2547236736.

The previous prime is 6438849871. The next prime is 6438849881. The reversal of 6438849872 is 2789488346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6438849871) 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 7 ways as a sum of consecutive naturals, for example, 2209688 + ... + 2212599.

Almost surely, 2^6438849872 is an apocalyptic number.

It is an amenable number.

6438849872 is an abundant number, since it is smaller than the sum of its proper divisors (8915334064).

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

6438849872 is a wasteful number, since it uses less digits than its factorization.

6438849872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422315 (or 4422309 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 59.

The square root of 6438849872 is about 80242.4443296688. Note that the first 3 decimals coincide. The cubic root of 6438849872 is about 1860.3847309904.

The spelling of 6438849872 in words is "six billion, four hundred thirty-eight million, eight hundred forty-nine thousand, eight hundred seventy-two".