3647645 has 8 divisors (see below), whose sum is σ = 4495704. Its totient is φ = 2839104.

The previous prime is 3647641. The next prime is 3647671. The reversal of 3647645 is 5467463.

It can be written as a sum of positive squares in 4 ways, for example, as 284089 + 3363556 = 533^2 + 1834^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3647645 - 2² = 3647641 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3647641) 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, 9674 + ... + 10043.

It is an arithmetic number, because the mean of its divisors is an integer number (561963).

Almost surely, 2^3647645 is an apocalyptic number.

It is an amenable number.

3647645 is a deficient number, since it is larger than the sum of its proper divisors (848059).

3647645 is a wasteful number, since it uses less digits than its factorization.

3647645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19759.

The product of its digits is 60480, while the sum is 35.

The square root of 3647645 is about 1909.8808863382. The cubic root of 3647645 is about 153.9350516026.

The spelling of 3647645 in words is "three million, six hundred forty-seven thousand, six hundred forty-five".