3561644 has 12 divisors (see below), whose sum is σ = 6321168. Its totient is φ = 1755600.

The previous prime is 3561643. The next prime is 3561659. The reversal of 3561644 is 4461653.

It is a happy number.

3561644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×3561644³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (3561641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5987 + ... + 6554.

It is an arithmetic number, because the mean of its divisors is an integer number (526764).

Almost surely, 2^3561644 is an apocalyptic number.

It is an amenable number.

3561644 is a deficient number, since it is larger than the sum of its proper divisors (2759524).

3561644 is a wasteful number, since it uses less digits than its factorization.

3561644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12616 (or 12614 counting only the distinct ones).

The product of its digits is 8640, while the sum is 29.

The square root of 3561644 is about 1887.2318352550. The cubic root of 3561644 is about 152.7156351075.

Subtracting 3561644 from its reverse (4461653), we obtain a palindrome (900009).

The spelling of 3561644 in words is "three million, five hundred sixty-one thousand, six hundred forty-four".