44981640 has 192 divisors, whose sum is σ = 164324160. Its totient is φ = 10575360.

The previous prime is 44981627. The next prime is 44981641. The reversal of 44981640 is 4618944.

It is a happy number.

44981640 is a `hidden beast` number, since 4 + 4 + 9 + 8 + 1 + 640 = 666.

44981640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 44981595 and 44981604.

It is not an unprimeable number, because it can be changed into a prime (44981641) 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, 146367 + ... + 146673.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^44981640 is an apocalyptic number.

44981640 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 44981640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82162080).

44981640 is an abundant number, since it is smaller than the sum of its proper divisors (119342520).

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

44981640 is a wasteful number, since it uses less digits than its factorization.

44981640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 372 (or 365 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 44981640 is about 6706.8353192843. The cubic root of 44981640 is about 355.6409501197.

The spelling of 44981640 in words is "forty-four million, nine hundred eighty-one thousand, six hundred forty".