643383224 has 64 divisors (see below), whose sum is σ = 1398371040. Its totient is φ = 274268160.

The previous prime is 643383211. The next prime is 643383229. The reversal of 643383224 is 422383346.

It is a happy number.

It is a Cunningham number, because it is equal to 25365²-1.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643383229) 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 15 ways as a sum of consecutive naturals, for example, 557432 + ... + 558584.

Almost surely, 2^643383224 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 643383224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (699185520).

643383224 is an abundant number, since it is smaller than the sum of its proper divisors (754987816).

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

643383224 is a wasteful number, since it uses less digits than its factorization.

643383224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1560 (or 1556 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 643383224 is about 25364.9999802878. Note that the first 4 decimals coincide. The cubic root of 643383224 is about 863.2897362076.

The spelling of 643383224 in words is "six hundred forty-three million, three hundred eighty-three thousand, two hundred twenty-four".