6687128 has 32 divisors (see below), whose sum is σ = 14628000. Its totient is φ = 2864736.

The previous prime is 6687127. The next prime is 6687133. The reversal of 6687128 is 8217866.

It is a nialpdrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 6687091 and 6687100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687127) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526 + ... + 3962.

It is an arithmetic number, because the mean of its divisors is an integer number (457125).

Almost surely, 2^6687128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6687128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7314000).

6687128 is an abundant number, since it is smaller than the sum of its proper divisors (7940872).

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

6687128 is a wasteful number, since it uses less digits than its factorization.

6687128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2446 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 6687128 is about 2585.9481820021. The cubic root of 6687128 is about 188.3995576401.

The spelling of 6687128 in words is "six million, six hundred eighty-seven thousand, one hundred twenty-eight".