643704470 has 8 divisors (see below), whose sum is σ = 1158668064. Its totient is φ = 257481784.

The previous prime is 643704461. The next prime is 643704499. The reversal of 643704470 is 74407346.

643704470 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 643704470.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32185214 + ... + 32185233.

It is an arithmetic number, because the mean of its divisors is an integer number (144833508).

Almost surely, 2^643704470 is an apocalyptic number.

643704470 is a deficient number, since it is larger than the sum of its proper divisors (514963594).

643704470 is a wasteful number, since it uses less digits than its factorization.

643704470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64370454.

The product of its (nonzero) digits is 56448, while the sum is 35.

The square root of 643704470 is about 25371.3316560247. The cubic root of 643704470 is about 863.4333946161.

The spelling of 643704470 in words is "six hundred forty-three million, seven hundred four thousand, four hundred seventy".