1644445222 has 16 divisors (see below), whose sum is σ = 2820667680. Its totient is φ = 704357568.

The previous prime is 1644445141. The next prime is 1644445247. The reversal of 1644445222 is 2225444461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7783 + ... + 57874.

It is an arithmetic number, because the mean of its divisors is an integer number (176291730).

Almost surely, 2^1644445222 is an apocalyptic number.

1644445222 is a deficient number, since it is larger than the sum of its proper divisors (1176222458).

1644445222 is a wasteful number, since it uses less digits than its factorization.

1644445222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67455.

The product of its digits is 61440, while the sum is 34.

The square root of 1644445222 is about 40551.7597891879. The cubic root of 1644445222 is about 1180.3382210592.

Adding to 1644445222 its reverse (2225444461), we get a palindrome (3869889683).

The spelling of 1644445222 in words is "one billion, six hundred forty-four million, four hundred forty-five thousand, two hundred twenty-two".