643605134 has 8 divisors (see below), whose sum is σ = 967021200. Its totient is φ = 321264736.

The previous prime is 643605133. The next prime is 643605143. The reversal of 643605134 is 431506346.

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

It is a super-2 number, since 2×643605134² = 828455137022315912, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 643605134.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643605133) 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, 267419 + ... + 269814.

It is an arithmetic number, because the mean of its divisors is an integer number (120877650).

Almost surely, 2^643605134 is an apocalyptic number.

643605134 is a deficient number, since it is larger than the sum of its proper divisors (323416066).

643605134 is a wasteful number, since it uses less digits than its factorization.

643605134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537834.

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 643605134 is about 25369.3739378803. The cubic root of 643605134 is about 863.3889775292.

The spelling of 643605134 in words is "six hundred forty-three million, six hundred five thousand, one hundred thirty-four".