643305464 has 8 divisors (see below), whose sum is σ = 1206197760. Its totient is φ = 321652728.

The previous prime is 643305437. The next prime is 643305493. The reversal of 643305464 is 464503346.

643305464 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40206584 + ... + 40206599.

It is an arithmetic number, because the mean of its divisors is an integer number (150774720).

Almost surely, 2^643305464 is an apocalyptic number.

It is an amenable number.

643305464 is a deficient number, since it is larger than the sum of its proper divisors (562892296).

643305464 is a wasteful number, since it uses less digits than its factorization.

643305464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80413189 (or 80413185 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 35.

The square root of 643305464 is about 25363.4671131531. The cubic root of 643305464 is about 863.2549554258.

The spelling of 643305464 in words is "six hundred forty-three million, three hundred five thousand, four hundred sixty-four".