6687690688 has 56 divisors (see below), whose sum is σ = 15337231200. Its totient is φ = 2833932288.

The previous prime is 6687690649. The next prime is 6687690701. The reversal of 6687690688 is 8860967866.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43993 + ... + 123736.

Almost surely, 2^6687690688 is an apocalyptic number.

It is an amenable number.

6687690688 is an abundant number, since it is smaller than the sum of its proper divisors (8649540512).

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

6687690688 is a wasteful number, since it uses less digits than its factorization.

6687690688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167837 (or 167827 counting only the distinct ones).

The product of its (nonzero) digits is 41803776, while the sum is 64.

The square root of 6687690688 is about 81778.3020611213. The cubic root of 6687690688 is about 1884.0484178186.

The spelling of 6687690688 in words is "six billion, six hundred eighty-seven million, six hundred ninety thousand, six hundred eighty-eight".