3686728 has 8 divisors (see below), whose sum is σ = 6912630. Its totient is φ = 1843360.

The previous prime is 3686723. The next prime is 3686729. The reversal of 3686728 is 8276863.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 3392964 + 293764 = 1842^2 + 542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (3686723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 230413 + ... + 230428.

Almost surely, 2^3686728 is an apocalyptic number.

It is an amenable number.

3686728 is a deficient number, since it is larger than the sum of its proper divisors (3225902).

3686728 is a wasteful number, since it uses less digits than its factorization.

3686728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 460847 (or 460843 counting only the distinct ones).

The product of its digits is 96768, while the sum is 40.

The square root of 3686728 is about 1920.0854147667. The cubic root of 3686728 is about 154.4828830057.

The spelling of 3686728 in words is "three million, six hundred eighty-six thousand, seven hundred twenty-eight".