44581616640 has 528 divisors, whose sum is σ = 169657259616. Its totient is φ = 10734796800.

The previous prime is 44581616627. The next prime is 44581616641. The reversal of 44581616640 is 4661618544.

44581616640 is a `hidden beast` number, since 4 + 4 + 581 + 6 + 1 + 6 + 64 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (528).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44581616641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 142433124 + ... + 142433436.

Almost surely, 2^44581616640 is an apocalyptic number.

44581616640 is a gapful number since it is divisible by the number (40) 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 44581616640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84828629808).

44581616640 is an abundant number, since it is smaller than the sum of its proper divisors (125075642976).

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

44581616640 is a wasteful number, since it uses less digits than its factorization.

44581616640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 615 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 45.

The spelling of 44581616640 in words is "forty-four billion, five hundred eighty-one million, six hundred sixteen thousand, six hundred forty".