3644645 has 4 divisors (see below), whose sum is σ = 4373580. Its totient is φ = 2915712.

The previous prime is 3644629. The next prime is 3644653. The reversal of 3644645 is 5464463.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2719201 + 925444 = 1649^2 + 962^2 .

It is a cyclic number.

It is not a de Polignac number, because 3644645 - 2⁴ = 3644629 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364460 + ... + 364469.

It is an arithmetic number, because the mean of its divisors is an integer number (1093395).

Almost surely, 2^3644645 is an apocalyptic number.

It is an amenable number.

3644645 is a deficient number, since it is larger than the sum of its proper divisors (728935).

3644645 is an equidigital number, since it uses as much as digits as its factorization.

3644645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728934.

The product of its digits is 34560, while the sum is 32.

The square root of 3644645 is about 1909.0953354927. The cubic root of 3644645 is about 153.8928388127.

The spelling of 3644645 in words is "three million, six hundred forty-four thousand, six hundred forty-five".