3639728 has 20 divisors (see below), whose sum is σ = 7120080. Its totient is φ = 1802304.

The previous prime is 3639719. The next prime is 3639733. The reversal of 3639728 is 8279363.

3639728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3639691 and 3639700.

It is an unprimeable number.

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, 701 + ... + 2787.

It is an arithmetic number, because the mean of its divisors is an integer number (356004).

Almost surely, 2^3639728 is an apocalyptic number.

It is an amenable number.

3639728 is a deficient number, since it is larger than the sum of its proper divisors (3480352).

3639728 is a wasteful number, since it uses less digits than its factorization.

3639728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2204 (or 2198 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 3639728 is about 1907.8071181333. The cubic root of 3639728 is about 153.8236019251.

The spelling of 3639728 in words is "three million, six hundred thirty-nine thousand, seven hundred twenty-eight".