22561644 has 48 divisors (see below), whose sum is σ = 61641216. Its totient is φ = 6288000.

The previous prime is 22561631. The next prime is 22561661. The reversal of 22561644 is 44616522.

It is a super-3 number, since 3×22561644³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 169 + ... + 6719.

It is an arithmetic number, because the mean of its divisors is an integer number (1284192).

Almost surely, 2^22561644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22561644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30820608).

22561644 is an abundant number, since it is smaller than the sum of its proper divisors (39079572).

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

22561644 is a wasteful number, since it uses less digits than its factorization.

22561644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6606 (or 6604 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 22561644 is about 4749.9098938822. The cubic root of 22561644 is about 282.5683923481.

The spelling of 22561644 in words is "twenty-two million, five hundred sixty-one thousand, six hundred forty-four".