6447489408 has 128 divisors (see below), whose sum is σ = 19082649600. Its totient is φ = 2143111680.

The previous prime is 6447489403. The next prime is 6447489443. The reversal of 6447489408 is 8049847446.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447489401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1321213 + ... + 1326083.

It is an arithmetic number, because the mean of its divisors is an integer number (149083200).

Almost surely, 2^6447489408 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 6447489408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9541324800).

6447489408 is an abundant number, since it is smaller than the sum of its proper divisors (12635160192).

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

6447489408 is a wasteful number, since it uses less digits than its factorization.

6447489408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5277 (or 5259 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 54.

The square root of 6447489408 is about 80296.2602367009. The cubic root of 6447489408 is about 1861.2164363296.

The spelling of 6447489408 in words is "six billion, four hundred forty-seven million, four hundred eighty-nine thousand, four hundred eight".