643066336 has 24 divisors (see below), whose sum is σ = 1381131864. Its totient is φ = 292302720.

The previous prime is 643066313. The next prime is 643066351. The reversal of 643066336 is 633660346.

It is a junction number, because it is equal to n+sod(n) for n = 643066295 and 643066304.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 913095 + ... + 913798.

It is an arithmetic number, because the mean of its divisors is an integer number (57547161).

Almost surely, 2^643066336 is an apocalyptic number.

It is an amenable number.

643066336 is an abundant number, since it is smaller than the sum of its proper divisors (738065528).

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

643066336 is a wasteful number, since it uses less digits than its factorization.

643066336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1826914 (or 1826906 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 37.

The square root of 643066336 is about 25358.7526507121. The cubic root of 643066336 is about 863.1479797999.

The spelling of 643066336 in words is "six hundred forty-three million, sixty-six thousand, three hundred thirty-six".