643521214 has 24 divisors (see below), whose sum is σ = 1132835328. Its totient is φ = 273349440.

The previous prime is 643521181. The next prime is 643521217. The reversal of 643521214 is 412125346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643521217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17982 + ... + 40129.

It is an arithmetic number, because the mean of its divisors is an integer number (47201472).

Almost surely, 2^643521214 is an apocalyptic number.

643521214 is a deficient number, since it is larger than the sum of its proper divisors (489314114).

643521214 is a wasteful number, since it uses less digits than its factorization.

643521214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58240 (or 58233 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 643521214 is about 25367.7199211912. The cubic root of 643521214 is about 863.3514499891.

The spelling of 643521214 in words is "six hundred forty-three million, five hundred twenty-one thousand, two hundred fourteen".