6449056728 has 64 divisors (see below), whose sum is σ = 16686259200. Its totient is φ = 2074899840.

The previous prime is 6449056727. The next prime is 6449056753. The reversal of 6449056728 is 8276509446.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6449056721) 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, 278275 + ... + 300557.

It is an arithmetic number, because the mean of its divisors is an integer number (260722800).

Almost surely, 2^6449056728 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 6449056728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8343129600).

6449056728 is an abundant number, since it is smaller than the sum of its proper divisors (10237202472).

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

6449056728 is a wasteful number, since it uses less digits than its factorization.

6449056728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22712 (or 22708 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 51.

The square root of 6449056728 is about 80306.0192513612. The cubic root of 6449056728 is about 1861.3672384593.

The spelling of 6449056728 in words is "six billion, four hundred forty-nine million, fifty-six thousand, seven hundred twenty-eight".