6438635836 has 6 divisors (see below), whose sum is σ = 11267612720. Its totient is φ = 3219317916.

The previous prime is 6438635813. The next prime is 6438635873. The reversal of 6438635836 is 6385368346.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804829476 + ... + 804829483.

Almost surely, 2^6438635836 is an apocalyptic number.

It is an amenable number.

6438635836 is a deficient number, since it is larger than the sum of its proper divisors (4828976884).

6438635836 is a wasteful number, since it uses less digits than its factorization.

6438635836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1609658963 (or 1609658961 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 52.

The square root of 6438635836 is about 80241.1106353844. The cubic root of 6438635836 is about 1860.3641168680.

The spelling of 6438635836 in words is "six billion, four hundred thirty-eight million, six hundred thirty-five thousand, eight hundred thirty-six".