222656 has 42 divisors (see below), whose sum is σ = 521208. Its totient is φ = 94080.

The previous prime is 222647. The next prime is 222659. The reversal of 222656 is 656222.

222656 = T₄₁ + T₄₂ + ... + T₁₁₁.

It is a happy number.

Its product of digits (1440) is a multiple of the sum of its prime divisors (80).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 222656.

It is not an unprimeable number, because it can be changed into a prime (222659) by changing a digit.

222656 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3101 + ... + 3171.

2²²²⁶⁵⁶ 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 222656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (260604).

222656 is an abundant number, since it is smaller than the sum of its proper divisors (298552).

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

222656 is an equidigital number, since it uses as much as digits as its factorization.

222656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97 (or 80 counting only the distinct ones).

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

The square root of 222656 is about 471.8643872979. The cubic root of 222656 is about 60.6100721385.

Adding to 222656 its reverse (656222), we get a palindrome (878878).

It can be divided in two parts, 222 and 656, that added together give a palindrome (878).

The spelling of 222656 in words is "two hundred twenty-two thousand, six hundred fifty-six".