6442783864 has 16 divisors (see below), whose sum is σ = 13178421720. Its totient is φ = 2928538080.

The previous prime is 6442783859. The next prime is 6442783903. The reversal of 6442783864 is 4683872446.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36606639 + ... + 36606814.

Almost surely, 2^6442783864 is an apocalyptic number.

It is an amenable number.

6442783864 is an abundant number, since it is smaller than the sum of its proper divisors (6735637856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6442783864 is a wasteful number, since it uses less digits than its factorization.

6442783864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73213470 (or 73213466 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 52.

The square root of 6442783864 is about 80266.9537481023. The cubic root of 6442783864 is about 1860.7635382190.

The spelling of 6442783864 in words is "six billion, four hundred forty-two million, seven hundred eighty-three thousand, eight hundred sixty-four".