6440147328 has 64 divisors (see below), whose sum is σ = 17658501120. Its totient is φ = 2077463040.

The previous prime is 6440147309. The next prime is 6440147333. The reversal of 6440147328 is 8237410446.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 258600 + ... + 282407.

It is an arithmetic number, because the mean of its divisors is an integer number (275914080).

Almost surely, 2^6440147328 is an apocalyptic number.

It is an amenable number.

6440147328 is an abundant number, since it is smaller than the sum of its proper divisors (11218353792).

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

6440147328 is a wasteful number, since it uses less digits than its factorization.

6440147328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541055 (or 541043 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 6440147328 is about 80250.5285216241. The cubic root of 6440147328 is about 1860.5096811119.

The spelling of 6440147328 in words is "six billion, four hundred forty million, one hundred forty-seven thousand, three hundred twenty-eight".