1644274012 has 12 divisors (see below), whose sum is σ = 2881589256. Its totient is φ = 820962800.

The previous prime is 1644273959. The next prime is 1644274013. The reversal of 1644274012 is 2104724461.

It is a super-3 number, since 3×1644274012³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644274013) 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 3 ways as a sum of consecutive naturals, for example, 290398 + ... + 296005.

It is an arithmetic number, because the mean of its divisors is an integer number (240132438).

Almost surely, 2^1644274012 is an apocalyptic number.

It is an amenable number.

1644274012 is a deficient number, since it is larger than the sum of its proper divisors (1237315244).

1644274012 is a wasteful number, since it uses less digits than its factorization.

1644274012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 587108 (or 587106 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 1644274012 is about 40549.6487284415. The cubic root of 1644274012 is about 1180.2972563379.

Adding to 1644274012 its reverse (2104724461), we get a palindrome (3748998473).

The spelling of 1644274012 in words is "one billion, six hundred forty-four million, two hundred seventy-four thousand, twelve".