1644055064 has 32 divisors (see below), whose sum is σ = 3162983040. Its totient is φ = 800659200.

The previous prime is 1644055033. The next prime is 1644055067. The reversal of 1644055064 is 4605504461.

It is a super-3 number, since 3×1644055064³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644055067) 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, 213017 + ... + 220599.

It is an arithmetic number, because the mean of its divisors is an integer number (98843220).

Almost surely, 2^1644055064 is an apocalyptic number.

It is an amenable number.

1644055064 is a deficient number, since it is larger than the sum of its proper divisors (1518927976).

1644055064 is a wasteful number, since it uses less digits than its factorization.

1644055064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8291 (or 8287 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 1644055064 is about 40546.9488864452. The cubic root of 1644055064 is about 1180.2448653955.

The spelling of 1644055064 in words is "one billion, six hundred forty-four million, fifty-five thousand, sixty-four".