643405034 has 4 divisors (see below), whose sum is σ = 965107554. Its totient is φ = 321702516.

The previous prime is 643405033. The next prime is 643405051. The reversal of 643405034 is 430504346.

643405034 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.

It can be written as a sum of positive squares in only one way, i.e., 396129409 + 247275625 = 19903^2 + 15725^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643404988 and 643405006.

It is not an unprimeable number, because it can be changed into a prime (643405033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160851257 + ... + 160851260.

Almost surely, 2^643405034 is an apocalyptic number.

643405034 is a deficient number, since it is larger than the sum of its proper divisors (321702520).

643405034 is a wasteful number, since it uses less digits than its factorization.

643405034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321702519.

The product of its (nonzero) digits is 17280, while the sum is 29.

The square root of 643405034 is about 25365.4298997671. The cubic root of 643405034 is about 863.2994909622.

The spelling of 643405034 in words is "six hundred forty-three million, four hundred five thousand, thirty-four".