44391994920 has 960 divisors, whose sum is σ = 189481556880. Its totient is φ = 9238634496.

The previous prime is 44391994897. The next prime is 44391994921. The reversal of 44391994920 is 2949919344.

It is a happy number.

44391994920 is a `hidden beast` number, since 443 + 9 + 199 + 4 + 9 + 2 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 8623351044 + 35768643876 = 92862^2 + 189126^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (44391994921) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 282751482 + ... + 282751638.

Almost surely, 2^44391994920 is an apocalyptic number.

44391994920 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 44391994920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94740778440).

44391994920 is an abundant number, since it is smaller than the sum of its proper divisors (145089561960).

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

44391994920 is a wasteful number, since it uses less digits than its factorization.

44391994920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 44391994920 in words is "forty-four billion, three hundred ninety-one million, nine hundred ninety-four thousand, nine hundred twenty".