6642763344 has 200 divisors, whose sum is σ = 22189115520. Its totient is φ = 1879241472.

The previous prime is 6642763339. The next prime is 6642763373. The reversal of 6642763344 is 4433672466.

6642763344 is a `hidden beast` number, since 6 + 6 + 4 + 2 + 7 + 633 + 4 + 4 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 6642763344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 930862 + ... + 937970.

Almost surely, 2^6642763344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6642763344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11094557760).

6642763344 is an abundant number, since it is smaller than the sum of its proper divisors (15546352176).

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

6642763344 is a wasteful number, since it uses less digits than its factorization.

6642763344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239 (or 7224 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 45.

The square root of 6642763344 is about 81503.1492888465. The cubic root of 6642763344 is about 1879.8199752169.

The spelling of 6642763344 in words is "six billion, six hundred forty-two million, seven hundred sixty-three thousand, three hundred forty-four".