6681428 has 12 divisors (see below), whose sum is σ = 12592020. Its totient is φ = 3083712.

The previous prime is 6681427. The next prime is 6681439. The reversal of 6681428 is 8241866.

It can be written as a sum of positive squares in 2 ways, for example, as 669124 + 6012304 = 818^2 + 2452^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6681421) 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 3 ways as a sum of consecutive naturals, for example, 64193 + ... + 64296.

It is an arithmetic number, because the mean of its divisors is an integer number (1049335).

Almost surely, 2^6681428 is an apocalyptic number.

It is an amenable number.

6681428 is a deficient number, since it is larger than the sum of its proper divisors (5910592).

6681428 is a wasteful number, since it uses less digits than its factorization.

6681428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128506 (or 128504 counting only the distinct ones).

The product of its digits is 18432, while the sum is 35.

The square root of 6681428 is about 2584.8458367957. The cubic root of 6681428 is about 188.3460128427.

The spelling of 6681428 in words is "six million, six hundred eighty-one thousand, four hundred twenty-eight".