643078796 has 12 divisors (see below), whose sum is σ = 1155804048. Its totient is φ = 312849072.

The previous prime is 643078783. The next prime is 643078811. The reversal of 643078796 is 697870346.

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, 2172416 + ... + 2172711.

It is an arithmetic number, because the mean of its divisors is an integer number (96317004).

Almost surely, 2^643078796 is an apocalyptic number.

It is an amenable number.

643078796 is a deficient number, since it is larger than the sum of its proper divisors (512725252).

643078796 is a wasteful number, since it uses less digits than its factorization.

643078796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345168 (or 4345166 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 50.

The square root of 643078796 is about 25358.9983240664. The cubic root of 643078796 is about 863.1535545251.

The spelling of 643078796 in words is "six hundred forty-three million, seventy-eight thousand, seven hundred ninety-six".