2217564 has 24 divisors (see below), whose sum is σ = 5749520. Its totient is φ = 739152.

The previous prime is 2217557. The next prime is 2217569. The reversal of 2217564 is 4657122.

2217564 is digitally balanced in base 2 and base 5, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2217569) 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 7 ways as a sum of consecutive naturals, for example, 10159 + ... + 10374.

2^2217564 is an apocalyptic number.

It is an amenable number.

2217564 is an abundant number, since it is smaller than the sum of its proper divisors (3531956).

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

2217564 is a wasteful number, since it uses less digits than its factorization.

2217564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20546 (or 20538 counting only the distinct ones).

The product of its digits is 3360, while the sum is 27.

The square root of 2217564 is about 1489.1487501254. The cubic root of 2217564 is about 130.4043426358.

The spelling of 2217564 in words is "two million, two hundred seventeen thousand, five hundred sixty-four".