1644268941 has 48 divisors (see below), whose sum is σ = 2865408000. Its totient is φ = 907133472.

The previous prime is 1644268921. The next prime is 1644268943. The reversal of 1644268941 is 1498624461.

It is not a de Polignac number, because 1644268941 - 2¹¹ = 1644266893 is a prime.

It is a super-3 number, since 3×1644268941³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644268943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 80340 + ... + 98706.

It is an arithmetic number, because the mean of its divisors is an integer number (59696000).

Almost surely, 2^1644268941 is an apocalyptic number.

It is an amenable number.

1644268941 is a deficient number, since it is larger than the sum of its proper divisors (1221139059).

1644268941 is a wasteful number, since it uses less digits than its factorization.

1644268941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18423 (or 18406 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 1644268941 is about 40549.5862001081. The cubic root of 1644268941 is about 1180.2960429770.

The spelling of 1644268941 in words is "one billion, six hundred forty-four million, two hundred sixty-eight thousand, nine hundred forty-one".