643972214 has 16 divisors (see below), whose sum is σ = 992806848. Its totient is φ = 313103112.

The previous prime is 643972163. The next prime is 643972229. The reversal of 643972214 is 412279346.

643972214 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3029 + ... + 36015.

It is an arithmetic number, because the mean of its divisors is an integer number (62050428).

Almost surely, 2^643972214 is an apocalyptic number.

643972214 is a deficient number, since it is larger than the sum of its proper divisors (348834634).

643972214 is a wasteful number, since it uses less digits than its factorization.

643972214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33259.

The product of its digits is 72576, while the sum is 38.

The square root of 643972214 is about 25376.6076141000. The cubic root of 643972214 is about 863.5530908828.

The spelling of 643972214 in words is "six hundred forty-three million, nine hundred seventy-two thousand, two hundred fourteen".