3647646 has 32 divisors (see below), whose sum is σ = 8371200. Its totient is φ = 1176120.

The previous prime is 3647641. The next prime is 3647671. The reversal of 3647646 is 6467463.

3647646 is a `hidden beast` number, since 3 + 6 + 4 + 7 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 3647646.

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 15 ways as a sum of consecutive naturals, for example, 585 + ... + 2763.

It is an arithmetic number, because the mean of its divisors is an integer number (261600).

Almost surely, 2^3647646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3647646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4185600).

3647646 is an abundant number, since it is smaller than the sum of its proper divisors (4723554).

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

3647646 is a wasteful number, since it uses less digits than its factorization.

3647646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221 (or 2215 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 3647646 is about 1909.8811481346. The cubic root of 3647646 is about 153.9350656697.

The spelling of 3647646 in words is "three million, six hundred forty-seven thousand, six hundred forty-six".