643448741 has 12 divisors (see below), whose sum is σ = 719233920. Its totient is φ = 574788240.

The previous prime is 643448731. The next prime is 643448747. The reversal of 643448741 is 147844346.

It is not a de Polignac number, because 643448741 - 2⁶ = 643448677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643448747) 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 11 ways as a sum of consecutive naturals, for example, 56171 + ... + 66648.

It is an arithmetic number, because the mean of its divisors is an integer number (59936160).

Almost surely, 2^643448741 is an apocalyptic number.

It is an amenable number.

643448741 is a deficient number, since it is larger than the sum of its proper divisors (75785179).

643448741 is a wasteful number, since it uses less digits than its factorization.

643448741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122876 (or 122863 counting only the distinct ones).

The product of its digits is 258048, while the sum is 41.

The square root of 643448741 is about 25366.2914317407. The cubic root of 643448741 is about 863.3190387195.

The spelling of 643448741 in words is "six hundred forty-three million, four hundred forty-eight thousand, seven hundred forty-one".