6448904720 has 20 divisors (see below), whose sum is σ = 14993703660. Its totient is φ = 2579561856.

The previous prime is 6448904711. The next prime is 6448904731. The reversal of 6448904720 is 274098446.

It can be written as a sum of positive squares in 2 ways, for example, as 4702667776 + 1746236944 = 68576^2 + 41788^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40305575 + ... + 40305734.

It is an arithmetic number, because the mean of its divisors is an integer number (749685183).

Almost surely, 2^6448904720 is an apocalyptic number.

It is an amenable number.

6448904720 is an abundant number, since it is smaller than the sum of its proper divisors (8544798940).

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

6448904720 is a wasteful number, since it uses less digits than its factorization.

6448904720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80611322 (or 80611316 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 44.

The square root of 6448904720 is about 80305.0728161055. The cubic root of 6448904720 is about 1861.3526138433.

The spelling of 6448904720 in words is "six billion, four hundred forty-eight million, nine hundred four thousand, seven hundred twenty".