643214328 has 32 divisors (see below), whose sum is σ = 1608956160. Its totient is φ = 214282080.

The previous prime is 643214321. The next prime is 643214333. The reversal of 643214328 is 823412346.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643214321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41601 + ... + 54927.

It is an arithmetic number, because the mean of its divisors is an integer number (50279880).

Almost surely, 2^643214328 is an apocalyptic number.

It is an amenable number.

643214328 is an abundant number, since it is smaller than the sum of its proper divisors (965741832).

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

643214328 is a wasteful number, since it uses less digits than its factorization.

643214328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15347 (or 15343 counting only the distinct ones).

The product of its digits is 27648, while the sum is 33.

The square root of 643214328 is about 25361.6704497160. The cubic root of 643214328 is about 863.2141882094.

The spelling of 643214328 in words is "six hundred forty-three million, two hundred fourteen thousand, three hundred twenty-eight".