641543232 has 224 divisors, whose sum is σ = 1980370944. Its totient is φ = 181350400.

The previous prime is 641543197. The next prime is 641543237. The reversal of 641543232 is 232345146.

It is a self number, because there is not a number n which added to its sum of digits gives 641543232.

It is not an unprimeable number, because it can be changed into a prime (641543237) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2282932 + ... + 2283212.

Almost surely, 2^641543232 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 641543232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (990185472).

641543232 is an abundant number, since it is smaller than the sum of its proper divisors (1338827712).

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

641543232 is a wasteful number, since it uses less digits than its factorization.

641543232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 377 (or 367 counting only the distinct ones).

The product of its digits is 17280, while the sum is 30.

The square root of 641543232 is about 25328.7037173243. The cubic root of 641543232 is about 862.4659851320.

Adding to 641543232 its reverse (232345146), we get a palindrome (873888378).

The spelling of 641543232 in words is "six hundred forty-one million, five hundred forty-three thousand, two hundred thirty-two".