6440550336 has 336 divisors, whose sum is σ = 20995648128. Its totient is φ = 1870387200.

The previous prime is 6440550329. The next prime is 6440550349. The reversal of 6440550336 is 6330550446.

6440550336 is a `hidden beast` number, since 64 + 40 + 550 + 3 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 6440550336.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19457691 + ... + 19458021.

It is an arithmetic number, because the mean of its divisors is an integer number (62487048).

Almost surely, 2^6440550336 is an apocalyptic number.

6440550336 is a gapful number since it is divisible by the number (66) 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 6440550336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10497824064).

6440550336 is an abundant number, since it is smaller than the sum of its proper divisors (14555097792).

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

6440550336 is a wasteful number, since it uses less digits than its factorization.

6440550336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480 (or 467 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 36.

The square root of 6440550336 is about 80253.0394190775. The cubic root of 6440550336 is about 1860.5484889532.

The spelling of 6440550336 in words is "six billion, four hundred forty million, five hundred fifty thousand, three hundred thirty-six".