643461214 has 16 divisors (see below), whose sum is σ = 1067769216. Its totient is φ = 288362200.

The previous prime is 643461209. The next prime is 643461227. The reversal of 643461214 is 412164346.

643461214 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, 204412 + ... + 207535.

It is an arithmetic number, because the mean of its divisors is an integer number (66735576).

Almost surely, 2^643461214 is an apocalyptic number.

643461214 is a deficient number, since it is larger than the sum of its proper divisors (424308002).

643461214 is a wasteful number, since it uses less digits than its factorization.

643461214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412031.

The product of its digits is 13824, while the sum is 31.

The square root of 643461214 is about 25366.5372883253. The cubic root of 643461214 is about 863.3246170498.

The spelling of 643461214 in words is "six hundred forty-three million, four hundred sixty-one thousand, two hundred fourteen".