3661564 has 6 divisors (see below), whose sum is σ = 6407744. Its totient is φ = 1830780.

The previous prime is 3661561. The next prime is 3661573. The reversal of 3661564 is 4651663.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 457692 + ... + 457699.

Almost surely, 2^3661564 is an apocalyptic number.

It is an amenable number.

3661564 is a deficient number, since it is larger than the sum of its proper divisors (2746180).

3661564 is a wasteful number, since it uses less digits than its factorization.

3661564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915395 (or 915393 counting only the distinct ones).

The product of its digits is 12960, while the sum is 31.

The square root of 3661564 is about 1913.5213612604. The cubic root of 3661564 is about 154.1306026510.

Subtracting 3661564 from its reverse (4651663), we obtain a palindrome (990099).

It can be divided in two parts, 3661 and 564, that added together give a square (4225 = 65²).

The spelling of 3661564 in words is "three million, six hundred sixty-one thousand, five hundred sixty-four".