1644163424 has 12 divisors (see below), whose sum is σ = 3236946804. Its totient is φ = 822081696.

The previous prime is 1644163421. The next prime is 1644163481. The reversal of 1644163424 is 4243614461.

It is a super-3 number, since 3×1644163424³ (a number of 29 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1644163421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25690022 + ... + 25690085.

It is an arithmetic number, because the mean of its divisors is an integer number (269745567).

Almost surely, 2^1644163424 is an apocalyptic number.

It is an amenable number.

1644163424 is a deficient number, since it is larger than the sum of its proper divisors (1592783380).

1644163424 is an equidigital number, since it uses as much as digits as its factorization.

1644163424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51380117 (or 51380109 counting only the distinct ones).

The product of its digits is 55296, while the sum is 35.

The square root of 1644163424 is about 40548.2850932071. The cubic root of 1644163424 is about 1180.2707948847.

Adding to 1644163424 its reverse (4243614461), we get a palindrome (5887777885).

The spelling of 1644163424 in words is "one billion, six hundred forty-four million, one hundred sixty-three thousand, four hundred twenty-four".