3643128 has 24 divisors (see below), whose sum is σ = 9867000. Its totient is φ = 1214352.

The previous prime is 3643127. The next prime is 3643139. The reversal of 3643128 is 8213463.

It is a happy number.

3643128 is a `hidden beast` number, since 3 + 643 + 12 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3643127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25228 + ... + 25371.

It is an arithmetic number, because the mean of its divisors is an integer number (411125).

Almost surely, 2^3643128 is an apocalyptic number.

It is an amenable number.

3643128 is an abundant number, since it is smaller than the sum of its proper divisors (6223872).

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

3643128 is a wasteful number, since it uses less digits than its factorization.

3643128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50611 (or 50604 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 3643128 is about 1908.6979855388. The cubic root of 3643128 is about 153.8714843932.

The spelling of 3643128 in words is "three million, six hundred forty-three thousand, one hundred twenty-eight".