6449945744 has 80 divisors (see below), whose sum is σ = 13769654400. Its totient is φ = 2902548480.

The previous prime is 6449945743. The next prime is 6449945759. The reversal of 6449945744 is 4475499446.

It is a self number, because there is not a number n which added to its sum of digits gives 6449945744.

It is not an unprimeable number, because it can be changed into a prime (6449945743) 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, 10767557 + ... + 10768155.

It is an arithmetic number, because the mean of its divisors is an integer number (172120680).

Almost surely, 2^6449945744 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 6449945744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6884827200).

6449945744 is an abundant number, since it is smaller than the sum of its proper divisors (7319708656).

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

6449945744 is a wasteful number, since it uses less digits than its factorization.

6449945744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128 (or 1122 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 56.

The square root of 6449945744 is about 80311.5542372329. The cubic root of 6449945744 is about 1861.4527656557.

The spelling of 6449945744 in words is "six billion, four hundred forty-nine million, nine hundred forty-five thousand, seven hundred forty-four".