1644322212 has 288 divisors, whose sum is σ = 5019356160. Its totient is φ = 449003520.

The previous prime is 1644322189. The next prime is 1644322249. The reversal of 1644322212 is 2122234461.

1644322212 is a `hidden beast` number, since 1 + 6 + 4 + 432 + 221 + 2 = 666.

It is a super-3 number, since 3×1644322212³ (a number of 29 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14551468 + ... + 14551580.

It is an arithmetic number, because the mean of its divisors is an integer number (17428320).

Almost surely, 2^1644322212 is an apocalyptic number.

1644322212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644322212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2509678080).

1644322212 is an abundant number, since it is smaller than the sum of its proper divisors (3375033948).

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

1644322212 is a wasteful number, since it uses less digits than its factorization.

1644322212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243 (or 238 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 1644322212 is about 40550.2430572247. The cubic root of 1644322212 is about 1180.3087892437.

Adding to 1644322212 its reverse (2122234461), we get a palindrome (3766556673).

The spelling of 1644322212 in words is "one billion, six hundred forty-four million, three hundred twenty-two thousand, two hundred twelve".