22215646 has 16 divisors (see below), whose sum is σ = 33981120. Its totient is φ = 10890880.

The previous prime is 22215629. The next prime is 22215667. The reversal of 22215646 is 64651222.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 23931 + ... + 24841.

It is an arithmetic number, because the mean of its divisors is an integer number (2123820).

Almost surely, 2^22215646 is an apocalyptic number.

22215646 is a deficient number, since it is larger than the sum of its proper divisors (11765474).

22215646 is a wasteful number, since it uses less digits than its factorization.

22215646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1139.

The product of its digits is 5760, while the sum is 28.

The square root of 22215646 is about 4713.3476425997. The cubic root of 22215646 is about 281.1164860279.

Adding to 22215646 its reverse (64651222), we get a palindrome (86866868).

The spelling of 22215646 in words is "twenty-two million, two hundred fifteen thousand, six hundred forty-six".