6349643644 has 24 divisors (see below), whose sum is σ = 11310944960. Its totient is φ = 3118362624.

The previous prime is 6349643623. The next prime is 6349643683. The reversal of 6349643644 is 4463469436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8932 + ... + 113044.

Almost surely, 2^6349643644 is an apocalyptic number.

It is an amenable number.

6349643644 is a deficient number, since it is larger than the sum of its proper divisors (4961301316).

6349643644 is a wasteful number, since it uses less digits than its factorization.

6349643644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104389 (or 104387 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 49.

The square root of 6349643644 is about 79684.6512447661. The cubic root of 6349643644 is about 1851.7532581823.

The spelling of 6349643644 in words is "six billion, three hundred forty-nine million, six hundred forty-three thousand, six hundred forty-four".