222640 has 60 divisors (see below), whose sum is σ = 593712. Its totient is φ = 77440.

The previous prime is 222619. The next prime is 222643. The reversal of 222640 is 46222.

222640 is digitally balanced in base 2, because in such base 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 (16).

It is not an unprimeable number, because it can be changed into a prime (222643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9669 + ... + 9691.

222640 is a Friedman number, since it can be written as 460*22^2, using all its digits and the basic arithmetic operations.

2²²²⁶⁴⁰ is an apocalyptic number.

222640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (296856).

222640 is an abundant number, since it is smaller than the sum of its proper divisors (371072).

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

222640 is a wasteful number, since it uses less digits than its factorization.

222640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 222640 is about 471.8474329696. The cubic root of 222640 is about 60.6086202959.

Adding to 222640 its reverse (46222), we get a palindrome (268862).

It can be divided in two parts, 22 and 2640, that added together give a palindrome (2662).

The spelling of 222640 in words is "two hundred twenty-two thousand, six hundred forty".