6439305216 has 168 divisors, whose sum is σ = 18119384640. Its totient is φ = 2030043136.

The previous prime is 6439305209. The next prime is 6439305217. The reversal of 6439305216 is 6125039346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439305217) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 72351700 + ... + 72351788.

It is an arithmetic number, because the mean of its divisors is an integer number (107853480).

Almost surely, 2^6439305216 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 6439305216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9059692320).

6439305216 is an abundant number, since it is smaller than the sum of its proper divisors (11680079424).

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

6439305216 is an frugal number, since it uses more digits than its factorization.

6439305216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 6439305216 is about 80245.2815809129. The cubic root of 6439305216 is about 1860.4285843220.

It can be divided in two parts, 6439 and 305216, that added together give a triangular number (311655 = T₇₈₉).

The spelling of 6439305216 in words is "six billion, four hundred thirty-nine million, three hundred five thousand, two hundred sixteen".