6386439688 has 16 divisors (see below), whose sum is σ = 12065985360. Its totient is φ = 3168843600.

The previous prime is 6386439667. The next prime is 6386439701. The reversal of 6386439688 is 8869346836.

It is a super-2 number, since 2×6386439688² = 81573223776923074688, which contains 22 as substring.

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, 3045918 + ... + 3048013.

It is an arithmetic number, because the mean of its divisors is an integer number (754124085).

Almost surely, 2^6386439688 is an apocalyptic number.

It is an amenable number.

6386439688 is a deficient number, since it is larger than the sum of its proper divisors (5679545672).

6386439688 is a wasteful number, since it uses less digits than its factorization.

6386439688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6094068 (or 6094064 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 61.

The square root of 6386439688 is about 79915.2031092958. The cubic root of 6386439688 is about 1855.3233272255.

The spelling of 6386439688 in words is "six billion, three hundred eighty-six million, four hundred thirty-nine thousand, six hundred eighty-eight".