634876643 has 4 divisors (see below), whose sum is σ = 635391120. Its totient is φ = 634362168.

The previous prime is 634876589. The next prime is 634876667. The reversal of 634876643 is 346678436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 634876643 - 2¹² = 634872547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634876043) 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, 255383 + ... + 257856.

It is an arithmetic number, because the mean of its divisors is an integer number (158847780).

Almost surely, 2^634876643 is an apocalyptic number.

634876643 is a deficient number, since it is larger than the sum of its proper divisors (514477).

634876643 is a wasteful number, since it uses less digits than its factorization.

634876643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514476.

The product of its digits is 1741824, while the sum is 47.

The square root of 634876643 is about 25196.7585812144. The cubic root of 634876643 is about 859.4681419407.

The spelling of 634876643 in words is "six hundred thirty-four million, eight hundred seventy-six thousand, six hundred forty-three".