1644000222 has 16 divisors (see below), whose sum is σ = 3288650112. Its totient is φ = 547891800.

The previous prime is 1644000179. The next prime is 1644000229. The reversal of 1644000222 is 2220004461.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644000229) 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, 9663 + ... + 58149.

It is an arithmetic number, because the mean of its divisors is an integer number (205540632).

Almost surely, 2^1644000222 is an apocalyptic number.

1644000222 is an abundant number, since it is smaller than the sum of its proper divisors (1644649890).

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

1644000222 is a wasteful number, since it uses less digits than its factorization.

1644000222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54143.

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

The square root of 1644000222 is about 40546.2726030396. The cubic root of 1644000222 is about 1180.2317418066.

Adding to 1644000222 its reverse (2220004461), we get a palindrome (3864004683).

The spelling of 1644000222 in words is "one billion, six hundred forty-four million, two hundred twenty-two", and thus it is an aban number.