6840728 has 16 divisors (see below), whose sum is σ = 12929280. Its totient is φ = 3392928.

The previous prime is 6840721. The next prime is 6840737. The reversal of 6840728 is 8270486.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840721) 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, 2351 + ... + 4382.

It is an arithmetic number, because the mean of its divisors is an integer number (808080).

Almost surely, 2^6840728 is an apocalyptic number.

It is an amenable number.

6840728 is a deficient number, since it is larger than the sum of its proper divisors (6088552).

6840728 is a wasteful number, since it uses less digits than its factorization.

6840728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6866 (or 6862 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 6840728 is about 2615.4785412999. The cubic root of 6840728 is about 189.8311334325.

The spelling of 6840728 in words is "six million, eight hundred forty thousand, seven hundred twenty-eight".