643570316 has 12 divisors (see below), whose sum is σ = 1126557432. Its totient is φ = 321696768.

The previous prime is 643570259. The next prime is 643570387. The reversal of 643570316 is 613075346.

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, 4085 + ... + 36108.

It is an arithmetic number, because the mean of its divisors is an integer number (93879786).

Almost surely, 2^643570316 is an apocalyptic number.

It is an amenable number.

643570316 is a deficient number, since it is larger than the sum of its proper divisors (482987116).

643570316 is a wasteful number, since it uses less digits than its factorization.

643570316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44200 (or 44198 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 35.

The square root of 643570316 is about 25368.6877074870. The cubic root of 643570316 is about 863.3734079312.

The spelling of 643570316 in words is "six hundred forty-three million, five hundred seventy thousand, three hundred sixteen".