6688431 has 6 divisors (see below), whose sum is σ = 9661080. Its totient is φ = 4458948.

The previous prime is 6688421. The next prime is 6688433. The reversal of 6688431 is 1348866.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-6688431 is a prime.

It is a super-2 number, since 2×6688431² = 89470218483522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6688433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 371571 + ... + 371588.

It is an arithmetic number, because the mean of its divisors is an integer number (1610180).

Almost surely, 2^6688431 is an apocalyptic number.

6688431 is a deficient number, since it is larger than the sum of its proper divisors (2972649).

6688431 is a wasteful number, since it uses less digits than its factorization.

6688431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743165 (or 743162 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 6688431 is about 2586.2001082670. The cubic root of 6688431 is about 188.4117935198.

The spelling of 6688431 in words is "six million, six hundred eighty-eight thousand, four hundred thirty-one".