644141532 has 12 divisors (see below), whose sum is σ = 1502996936. Its totient is φ = 214713840.

The previous prime is 644141513. The next prime is 644141549. The reversal of 644141532 is 235141446.

644141532 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 644141532.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26839219 + ... + 26839242.

Almost surely, 2^644141532 is an apocalyptic number.

It is an amenable number.

644141532 is an abundant number, since it is smaller than the sum of its proper divisors (858855404).

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

644141532 is a wasteful number, since it uses less digits than its factorization.

644141532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53678468 (or 53678466 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 644141532 is about 25379.9434987551. The cubic root of 644141532 is about 863.6287682005.

Adding to 644141532 its reverse (235141446), we get a palindrome (879282978).

The spelling of 644141532 in words is "six hundred forty-four million, one hundred forty-one thousand, five hundred thirty-two".