634005689 has 4 divisors (see below), whose sum is σ = 636636660. Its totient is φ = 631374720.

The previous prime is 634005683. The next prime is 634005703. The reversal of 634005689 is 986500436.

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

It can be written as a sum of positive squares in 2 ways, for example, as 229674025 + 404331664 = 15155^2 + 20108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634005689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (634005683) 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, 1315124 + ... + 1315605.

It is an arithmetic number, because the mean of its divisors is an integer number (159159165).

Almost surely, 2^634005689 is an apocalyptic number.

It is an amenable number.

634005689 is a deficient number, since it is larger than the sum of its proper divisors (2630971).

634005689 is a wasteful number, since it uses less digits than its factorization.

634005689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2630970.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 634005689 is about 25179.4695933016. The cubic root of 634005689 is about 859.0749423129.

The spelling of 634005689 in words is "six hundred thirty-four million, five thousand, six hundred eighty-nine".