643303232 has 84 divisors (see below), whose sum is σ = 1508247936. Its totient is φ = 269867520.

The previous prime is 643303223. The next prime is 643303249. The reversal of 643303232 is 232303346.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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, 116273 + ... + 121679.

Almost surely, 2^643303232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643303232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (754123968).

643303232 is an abundant number, since it is smaller than the sum of its proper divisors (864944704).

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

643303232 is a wasteful number, since it uses less digits than its factorization.

643303232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5456 (or 5433 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 26.

The square root of 643303232 is about 25363.4231128213. The cubic root of 643303232 is about 863.2539570472.

Adding to 643303232 its reverse (232303346), we get a palindrome (875606578).

The spelling of 643303232 in words is "six hundred forty-three million, three hundred three thousand, two hundred thirty-two".