6690728 has 16 divisors (see below), whose sum is σ = 13685760. Its totient is φ = 3041200.

The previous prime is 6690721. The next prime is 6690737. The reversal of 6690728 is 8270966.

It is a junction number, because it is equal to n+sod(n) for n = 6690691 and 6690700.

It is not an unprimeable number, because it can be changed into a prime (6690721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37928 + ... + 38103.

It is an arithmetic number, because the mean of its divisors is an integer number (855360).

Almost surely, 2^6690728 is an apocalyptic number.

It is an amenable number.

6690728 is an abundant number, since it is smaller than the sum of its proper divisors (6995032).

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

6690728 is a wasteful number, since it uses less digits than its factorization.

6690728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76048 (or 76044 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 6690728 is about 2586.6441579777. The cubic root of 6690728 is about 188.4333597314.

The spelling of 6690728 in words is "six million, six hundred ninety thousand, seven hundred twenty-eight".