643271346 has 24 divisors (see below), whose sum is σ = 1395947280. Its totient is φ = 214086456.

The previous prime is 643271333. The next prime is 643271411. The reversal of 643271346 is 643172346.

It is a happy number.

643271346 is a `hidden beast` number, since 6 + 43 + 271 + 346 = 666.

643271346 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 643271346.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16216 + ... + 39363.

It is an arithmetic number, because the mean of its divisors is an integer number (58164470).

Almost surely, 2^643271346 is an apocalyptic number.

643271346 is an abundant number, since it is smaller than the sum of its proper divisors (752675934).

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

643271346 is a wasteful number, since it uses less digits than its factorization.

643271346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56230 (or 56227 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 643271346 is about 25362.7945226862. The cubic root of 643271346 is about 863.2396941153.

The spelling of 643271346 in words is "six hundred forty-three million, two hundred seventy-one thousand, three hundred forty-six".