1644322244 has 24 divisors (see below), whose sum is σ = 3086173440. Its totient is φ = 764191584.

The previous prime is 1644322189. The next prime is 1644322249. The reversal of 1644322244 is 4422234461.

It is a super-3 number, since 3×1644322244³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1644322244.

It is not an unprimeable number, because it can be changed into a prime (1644322249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200084 + ... + 208139.

It is an arithmetic number, because the mean of its divisors is an integer number (128590560).

Almost surely, 2^1644322244 is an apocalyptic number.

It is an amenable number.

1644322244 is a deficient number, since it is larger than the sum of its proper divisors (1441851196).

1644322244 is a wasteful number, since it uses less digits than its factorization.

1644322244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408299 (or 408297 counting only the distinct ones).

The product of its digits is 36864, while the sum is 32.

The square root of 1644322244 is about 40550.2434517969. The cubic root of 1644322244 is about 1180.3087969003.

The spelling of 1644322244 in words is "one billion, six hundred forty-four million, three hundred twenty-two thousand, two hundred forty-four".