3640028 has 24 divisors (see below), whose sum is σ = 7386624. Its totient is φ = 1537200.

The previous prime is 3640027. The next prime is 3640031. The reversal of 3640028 is 8200463.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3639985 and 3640012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3640027) 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 7 ways as a sum of consecutive naturals, for example, 1073 + ... + 2903.

It is an arithmetic number, because the mean of its divisors is an integer number (307776).

Almost surely, 2^3640028 is an apocalyptic number.

It is an amenable number.

3640028 is an abundant number, since it is smaller than the sum of its proper divisors (3746596).

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

3640028 is a wasteful number, since it uses less digits than its factorization.

3640028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1913 (or 1911 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 3640028 is about 1907.8857408136. The cubic root of 3640028 is about 153.8278280479.

The spelling of 3640028 in words is "three million, six hundred forty thousand, twenty-eight".