643381696 has 14 divisors (see below), whose sum is σ = 1276710680. Its totient is φ = 321690816.

The previous prime is 643381679. The next prime is 643381699. The reversal of 643381696 is 696183346.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643381699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5026356 + ... + 5026483.

It is an arithmetic number, because the mean of its divisors is an integer number (91193620).

Almost surely, 2^643381696 is an apocalyptic number.

It is an amenable number.

643381696 is a deficient number, since it is larger than the sum of its proper divisors (633328984).

643381696 is a wasteful number, since it uses less digits than its factorization.

643381696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10052851 (or 10052841 counting only the distinct ones).

The product of its digits is 559872, while the sum is 46.

The square root of 643381696 is about 25364.9698600255. The cubic root of 643381696 is about 863.2890527850.

The spelling of 643381696 in words is "six hundred forty-three million, three hundred eighty-one thousand, six hundred ninety-six".