6440336784 has 80 divisors (see below), whose sum is σ = 21127040640. Its totient is φ = 1840095360.

The previous prime is 6440336737. The next prime is 6440336827. The reversal of 6440336784 is 4876330446.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1061847 + ... + 1067894.

It is an arithmetic number, because the mean of its divisors is an integer number (264088008).

Almost surely, 2^6440336784 is an apocalyptic number.

It is an amenable number.

6440336784 is an abundant number, since it is smaller than the sum of its proper divisors (14686703856).

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

6440336784 is a wasteful number, since it uses less digits than its factorization.

6440336784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129765 (or 2129753 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 45.

The square root of 6440336784 is about 80251.7089163838. The cubic root of 6440336784 is about 1860.5279250664.

The spelling of 6440336784 in words is "six billion, four hundred forty million, three hundred thirty-six thousand, seven hundred eighty-four".