1644057044 has 12 divisors (see below), whose sum is σ = 3288114144. Its totient is φ = 704595864.

The previous prime is 1644057011. The next prime is 1644057091. The reversal of 1644057044 is 4407504461.

1644057044 is an admirable number.

It is a super-3 number, since 3×1644057044³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1644056995 and 1644057013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29358134 + ... + 29358189.

It is an arithmetic number, because the mean of its divisors is an integer number (274009512).

Almost surely, 2^1644057044 is an apocalyptic number.

1644057044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1644057044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1644057044 is a wasteful number, since it uses less digits than its factorization.

1644057044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58716334 (or 58716332 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 35.

The square root of 1644057044 is about 40546.9733025783. The cubic root of 1644057044 is about 1180.2453392004.

The spelling of 1644057044 in words is "one billion, six hundred forty-four million, fifty-seven thousand, forty-four".