3645128 has 16 divisors (see below), whose sum is σ = 6964380. Its totient is φ = 1787968.

The previous prime is 3645121. The next prime is 3645133. The reversal of 3645128 is 8215463.

It can be written as a sum of positive squares in 2 ways, for example, as 3467044 + 178084 = 1862^2 + 422^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3645128.

It is not an unprimeable number, because it can be changed into a prime (3645121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3875 + ... + 4722.

Almost surely, 2^3645128 is an apocalyptic number.

It is an amenable number.

3645128 is a deficient number, since it is larger than the sum of its proper divisors (3319252).

3645128 is a wasteful number, since it uses less digits than its factorization.

3645128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8656 (or 8652 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 3645128 is about 1909.2218310086. The cubic root of 3645128 is about 153.8996366360.

It can be divided in two parts, 3645 and 128, that added together give a palindrome (3773).

The spelling of 3645128 in words is "three million, six hundred forty-five thousand, one hundred twenty-eight".