6439963800 has 192 divisors, whose sum is σ = 21631294080. Its totient is φ = 1578608640.

The previous prime is 6439963787. The next prime is 6439963801. The reversal of 6439963800 is 83699346.

It is a self number, because there is not a number n which added to its sum of digits gives 6439963800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6439963801) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 431259 + ... + 445941.

It is an arithmetic number, because the mean of its divisors is an integer number (112662990).

Almost surely, 2^6439963800 is an apocalyptic number.

6439963800 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6439963800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10815647040).

6439963800 is an abundant number, since it is smaller than the sum of its proper divisors (15191330280).

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

6439963800 is a wasteful number, since it uses less digits than its factorization.

6439963800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14762 (or 14753 counting only the distinct ones).

The product of its (nonzero) digits is 839808, while the sum is 48.

The square root of 6439963800 is about 80249.3850443728. The cubic root of 6439963800 is about 1860.4920076619.

The spelling of 6439963800 in words is "six billion, four hundred thirty-nine million, nine hundred sixty-three thousand, eight hundred".