44181720 has 128 divisors (see below), whose sum is σ = 160704000. Its totient is φ = 10707840.

The previous prime is 44181679. The next prime is 44181721. The reversal of 44181720 is 2718144.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44181721) 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, 10021 + ... + 13739.

It is an arithmetic number, because the mean of its divisors is an integer number (1255500).

Almost surely, 2^44181720 is an apocalyptic number.

44181720 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 44181720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80352000).

44181720 is an abundant number, since it is smaller than the sum of its proper divisors (116522280).

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

44181720 is a wasteful number, since it uses less digits than its factorization.

44181720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3750 (or 3740 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 27.

The square root of 44181720 is about 6646.9331273904. The cubic root of 44181720 is about 353.5201772755.

Adding to 44181720 its reverse (2718144), we get a palindrome (46899864).

The spelling of 44181720 in words is "forty-four million, one hundred eighty-one thousand, seven hundred twenty".