6448721748 has 48 divisors (see below), whose sum is σ = 17201681280. Its totient is φ = 1841946624.

The previous prime is 6448721701. The next prime is 6448721789. The reversal of 6448721748 is 8471278446.

It is a self number, because there is not a number n which added to its sum of digits gives 6448721748.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 337540 + ... + 356132.

It is an arithmetic number, because the mean of its divisors is an integer number (358368360).

Almost surely, 2^6448721748 is an apocalyptic number.

It is an amenable number.

6448721748 is an abundant number, since it is smaller than the sum of its proper divisors (10752959532).

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

6448721748 is a wasteful number, since it uses less digits than its factorization.

6448721748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22736 (or 22734 counting only the distinct ones).

The product of its digits is 2408448, while the sum is 51.

The square root of 6448721748 is about 80303.9335773784. The cubic root of 6448721748 is about 1861.3350098911.

The spelling of 6448721748 in words is "six billion, four hundred forty-eight million, seven hundred twenty-one thousand, seven hundred forty-eight".