643429473 has 4 divisors (see below), whose sum is σ = 857905968. Its totient is φ = 428952980.

The previous prime is 643429469. The next prime is 643429513. The reversal of 643429473 is 374924346.

It is a happy number.

643429473 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 643429473 - 2² = 643429469 is a prime.

It is not an unprimeable number, because it can be changed into a prime (643429453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107238243 + ... + 107238248.

It is an arithmetic number, because the mean of its divisors is an integer number (214476492).

Almost surely, 2^643429473 is an apocalyptic number.

It is an amenable number.

643429473 is a deficient number, since it is larger than the sum of its proper divisors (214476495).

643429473 is a wasteful number, since it uses less digits than its factorization.

643429473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214476494.

The product of its digits is 435456, while the sum is 42.

The square root of 643429473 is about 25365.9116335290. The cubic root of 643429473 is about 863.3104213031.

The spelling of 643429473 in words is "six hundred forty-three million, four hundred twenty-nine thousand, four hundred seventy-three".