6641728 has 28 divisors (see below), whose sum is σ = 13283692. Its totient is φ = 3294720.

The previous prime is 6641717. The next prime is 6641729. The reversal of 6641728 is 8271466.

It can be written as a sum of positive squares in 2 ways, for example, as 3655744 + 2985984 = 1912^2 + 1728^2 .

It is a super-2 number, since 2×6641728² = 88225101651968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6641693 and 6641702.

It is not an unprimeable number, because it can be changed into a prime (6641729) 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, 9718 + ... + 10378.

Almost surely, 2^6641728 is an apocalyptic number.

It is an amenable number.

6641728 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

6641728 is a wasteful number, since it uses less digits than its factorization.

6641728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830 (or 820 counting only the distinct ones).

The product of its digits is 16128, while the sum is 34.

The square root of 6641728 is about 2577.1550205605. The cubic root of 6641728 is about 187.9722306955.

The spelling of 6641728 in words is "six million, six hundred forty-one thousand, seven hundred twenty-eight".