6449989488 has 80 divisors (see below), whose sum is σ = 16910480160. Its totient is φ = 2118172672.

The previous prime is 6449989423. The next prime is 6449989531. The reversal of 6449989488 is 8849899446.

It is a super-5 number, since 5×6449989488⁵ (a number of 50 digits) contains 55555 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1249120 + ... + 1254272.

It is an arithmetic number, because the mean of its divisors is an integer number (211381002).

Almost surely, 2^6449989488 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 6449989488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8455240080).

6449989488 is an abundant number, since it is smaller than the sum of its proper divisors (10460490672).

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

6449989488 is a wasteful number, since it uses less digits than its factorization.

6449989488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5546 (or 5540 counting only the distinct ones).

The product of its digits is 143327232, while the sum is 69.

The square root of 6449989488 is about 80311.8265761650. The cubic root of 6449989488 is about 1861.4569738154.

The spelling of 6449989488 in words is "six billion, four hundred forty-nine million, nine hundred eighty-nine thousand, four hundred eighty-eight".