22640222 has 16 divisors (see below), whose sum is σ = 37748592. Its totient is φ = 10096320.

The previous prime is 22640221. The next prime is 22640249. The reversal of 22640222 is 22204622.

It is a junction number, because it is equal to n+sod(n) for n = 22640194 and 22640203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22640221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8543 + ... + 10874.

It is an arithmetic number, because the mean of its divisors is an integer number (2359287).

Almost surely, 2^22640222 is an apocalyptic number.

22640222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

22640222 is a deficient number, since it is larger than the sum of its proper divisors (15108370).

22640222 is a wasteful number, since it uses less digits than its factorization.

22640222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19483.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 22640222 is about 4758.1742296810. The cubic root of 22640222 is about 282.8960565884.

Adding to 22640222 its reverse (22204622), we get a palindrome (44844844).

Subtracting from 22640222 its reverse (22204622), we obtain a square (435600 = 660²).

The spelling of 22640222 in words is "twenty-two million, six hundred forty thousand, two hundred twenty-two".