6688940 has 12 divisors (see below), whose sum is σ = 14046816. Its totient is φ = 2675568.

The previous prime is 6688933. The next prime is 6688943. The reversal of 6688940 is 498866.

It is not an unprimeable number, because it can be changed into a prime (6688943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167204 + ... + 167243.

It is an arithmetic number, because the mean of its divisors is an integer number (1170568).

Almost surely, 2^6688940 is an apocalyptic number.

It is an amenable number.

6688940 is an abundant number, since it is smaller than the sum of its proper divisors (7357876).

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

6688940 is a wasteful number, since it uses less digits than its factorization.

6688940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334456 (or 334454 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 6688940 is about 2586.2985133198. The cubic root of 6688940 is about 188.4165728754.

The spelling of 6688940 in words is "six million, six hundred eighty-eight thousand, nine hundred forty".