3221564 has 36 divisors (see below), whose sum is σ = 6272784. Its totient is φ = 1444608.

The previous prime is 3221557. The next prime is 3221567. The reversal of 3221564 is 4651223.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221567) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33164 + ... + 33260.

It is an arithmetic number, because the mean of its divisors is an integer number (174244).

Almost surely, 2^3221564 is an apocalyptic number.

It is an amenable number.

3221564 is a deficient number, since it is larger than the sum of its proper divisors (3051220).

3221564 is a wasteful number, since it uses less digits than its factorization.

3221564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 141 counting only the distinct ones).

The product of its digits is 1440, while the sum is 23.

The square root of 3221564 is about 1794.8715831502. The cubic root of 3221564 is about 147.6915294152.

Adding to 3221564 its reverse (4651223), we get a palindrome (7872787).

The spelling of 3221564 in words is "three million, two hundred twenty-one thousand, five hundred sixty-four".