6687644736 has 28 divisors (see below), whose sum is σ = 17694393872. Its totient is φ = 2229214848.

The previous prime is 6687644723. The next prime is 6687644801. The reversal of 6687644736 is 6374467866.

It is a super-3 number, since 3×6687644736³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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, 17415550 + ... + 17415933.

Almost surely, 2^6687644736 is an apocalyptic number.

It is an amenable number.

6687644736 is an abundant number, since it is smaller than the sum of its proper divisors (11006749136).

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

6687644736 is a wasteful number, since it uses less digits than its factorization.

6687644736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34831498 (or 34831488 counting only the distinct ones).

The product of its digits is 24385536, while the sum is 57.

The square root of 6687644736 is about 81778.0211059182. The cubic root of 6687644736 is about 1884.0441026274.

The spelling of 6687644736 in words is "six billion, six hundred eighty-seven million, six hundred forty-four thousand, seven hundred thirty-six".