6444502008 has 128 divisors (see below), whose sum is σ = 18862571520. Its totient is φ = 1796561280.

The previous prime is 6444502007. The next prime is 6444502019. The reversal of 6444502008 is 8002054446.

It is a super-2 number, since 2×6444502008² = 83063212262232064128, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6444502008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6444502007) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3023103 + ... + 3025233.

It is an arithmetic number, because the mean of its divisors is an integer number (147363840).

Almost surely, 2^6444502008 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 6444502008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9431285760).

6444502008 is an abundant number, since it is smaller than the sum of its proper divisors (12418069512).

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

6444502008 is a wasteful number, since it uses less digits than its factorization.

6444502008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2577 (or 2573 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 33.

The square root of 6444502008 is about 80277.6557206300. The cubic root of 6444502008 is about 1860.9289312967.

The spelling of 6444502008 in words is "six billion, four hundred forty-four million, five hundred two thousand, eight".