6388668836 has 72 divisors (see below), whose sum is σ = 12546223032. Its totient is φ = 2843596800.

The previous prime is 6388668829. The next prime is 6388668859.

6388668836 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 634536100 + 5754132736 = 25190^2 + 75856^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10421666 + ... + 10422278.

Almost surely, 2^6388668836 is an apocalyptic number.

It is an amenable number.

6388668836 is a deficient number, since it is larger than the sum of its proper divisors (6157554196).

6388668836 is a wasteful number, since it uses less digits than its factorization.

6388668836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053 (or 1040 counting only the distinct ones).

The product of its digits is 47775744, while the sum is 62.

The square root of 6388668836 is about 79929.1488507165. The cubic root of 6388668836 is about 1855.5391652296.

The spelling of 6388668836 in words is "six billion, three hundred eighty-eight million, six hundred sixty-eight thousand, eight hundred thirty-six".