644613530000 has 100 divisors (see below), whose sum is σ = 1702553545968. Its totient is φ = 234404880000.

The previous prime is 644613529993. The next prime is 644613530047. The reversal of 644613530000 is 35316446.

It is a tau number, because it is divible by the number of its divisors (100).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2820062 + ... + 3040061.

Almost surely, 2^644613530000 is an apocalyptic number.

It is an amenable number.

644613530000 is an abundant number, since it is smaller than the sum of its proper divisors (1057940015968).

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

644613530000 is a wasteful number, since it uses less digits than its factorization.

644613530000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5860162 (or 5860141 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

Adding to 644613530000 its reverse (35316446), we get a palindrome (644648846446).

The spelling of 644613530000 in words is "six hundred forty-four billion, six hundred thirteen million, five hundred thirty thousand".