44221618 has 20 divisors (see below), whose sum is σ = 77391630. Its totient is φ = 18950064.

The previous prime is 44221613. The next prime is 44221633. The reversal of 44221618 is 81612244.

It can be written as a sum of positive squares in only one way, i.e., 42471289 + 1750329 = 6517^2 + 1323^2 .

It is not an unprimeable number, because it can be changed into a prime (44221613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 198 + ... + 9406.

Almost surely, 2^44221618 is an apocalyptic number.

44221618 is a deficient number, since it is larger than the sum of its proper divisors (33170012).

44221618 is an frugal number, since it uses more digits than its factorization.

44221618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239 (or 9218 counting only the distinct ones).

The product of its digits is 3072, while the sum is 28.

The square root of 44221618 is about 6649.9336838799. The cubic root of 44221618 is about 353.6265599184.

The spelling of 44221618 in words is "forty-four million, two hundred twenty-one thousand, six hundred eighteen".