44021640 has 64 divisors (see below), whose sum is σ = 142228800. Its totient is φ = 10835712.

The previous prime is 44021639. The next prime is 44021693. The reversal of 44021640 is 4612044.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12550 + ... + 15669.

It is an arithmetic number, because the mean of its divisors is an integer number (2222325).

Almost surely, 2^44021640 is an apocalyptic number.

44021640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

44021640 is an abundant number, since it is smaller than the sum of its proper divisors (98207160).

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

44021640 is a wasteful number, since it uses less digits than its factorization.

44021640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28246 (or 28242 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 44021640 is about 6634.8805565737. The cubic root of 44021640 is about 353.0927003636.

Adding to 44021640 its reverse (4612044), we get a palindrome (48633684).

The spelling of 44021640 in words is "forty-four million, twenty-one thousand, six hundred forty".