6665728 has 40 divisors (see below), whose sum is σ = 13650912. Its totient is φ = 3250176.

The previous prime is 6665719. The next prime is 6665741. The reversal of 6665728 is 8275666.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23926 + ... + 24202.

Almost surely, 2^6665728 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 6665728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6825456).

6665728 is an abundant number, since it is smaller than the sum of its proper divisors (6985184).

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

6665728 is an equidigital number, since it uses as much as digits as its factorization.

6665728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 326 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 6665728 is about 2581.8071190544. The cubic root of 6665728 is about 188.1983721701.

The spelling of 6665728 in words is "six million, six hundred sixty-five thousand, seven hundred twenty-eight".