643314188 has 24 divisors (see below), whose sum is σ = 1237121424. Its totient is φ = 290278400.

The previous prime is 643314181. The next prime is 643314197. The reversal of 643314188 is 881413346.

It is not an unprimeable number, because it can be changed into a prime (643314181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47333 + ... + 59388.

It is an arithmetic number, because the mean of its divisors is an integer number (51546726).

Almost surely, 2^643314188 is an apocalyptic number.

It is an amenable number.

643314188 is a deficient number, since it is larger than the sum of its proper divisors (593807236).

643314188 is a wasteful number, since it uses less digits than its factorization.

643314188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106873 (or 106871 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 643314188 is about 25363.6390922123. The cubic root of 643314188 is about 863.2588576685.

The spelling of 643314188 in words is "six hundred forty-three million, three hundred fourteen thousand, one hundred eighty-eight".