643268212 has 12 divisors (see below), whose sum is σ = 1125899460. Its totient is φ = 321582656.

The previous prime is 643268137. The next prime is 643268221. The reversal of 643268212 is 212862346.

It can be written as a sum of positive squares in 2 ways, for example, as 455139556 + 188128656 = 21334^2 + 13716^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35328 + ... + 50344.

It is an arithmetic number, because the mean of its divisors is an integer number (93824955).

Almost surely, 2^643268212 is an apocalyptic number.

It is an amenable number.

643268212 is a deficient number, since it is larger than the sum of its proper divisors (482631248).

643268212 is a wasteful number, since it uses less digits than its factorization.

643268212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25730 (or 25728 counting only the distinct ones).

The product of its digits is 27648, while the sum is 34.

The square root of 643268212 is about 25362.7327391983. The cubic root of 643268212 is about 863.2382922198.

The spelling of 643268212 in words is "six hundred forty-three million, two hundred sixty-eight thousand, two hundred twelve".