6688988927 has 4 divisors (see below), whose sum is σ = 6691037136. Its totient is φ = 6686940720.

The previous prime is 6688988923. The next prime is 6688988941. The reversal of 6688988927 is 7298898866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6688988927 - 2² = 6688988923 is a prime.

It is a super-2 number, since 2×6688988927² = 89485145731057222658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688988923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1019198 + ... + 1025739.

It is an arithmetic number, because the mean of its divisors is an integer number (1672759284).

Almost surely, 2^6688988927 is an apocalyptic number.

6688988927 is a deficient number, since it is larger than the sum of its proper divisors (2048209).

6688988927 is a wasteful number, since it uses less digits than its factorization.

6688988927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2048208.

The product of its digits is 167215104, while the sum is 71.

The square root of 6688988927 is about 81786.2392276354. The cubic root of 6688988927 is about 1884.1703227228.

The spelling of 6688988927 in words is "six billion, six hundred eighty-eight million, nine hundred eighty-eight thousand, nine hundred twenty-seven".