643144108 has 12 divisors (see below), whose sum is σ = 1132009200. Its totient is φ = 319712912.

The previous prime is 643144097. The next prime is 643144109. The reversal of 643144108 is 801441346.

643144108 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 643144108.

It is not an unprimeable number, because it can be changed into a prime (643144109) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 464008 + ... + 465391.

It is an arithmetic number, because the mean of its divisors is an integer number (94334100).

Almost surely, 2^643144108 is an apocalyptic number.

It is an amenable number.

643144108 is a deficient number, since it is larger than the sum of its proper divisors (488865092).

643144108 is a wasteful number, since it uses less digits than its factorization.

643144108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929576 (or 929574 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 643144108 is about 25360.2860393963. The cubic root of 643144108 is about 863.1827745714.

The spelling of 643144108 in words is "six hundred forty-three million, one hundred forty-four thousand, one hundred eight".