222288444 has 72 divisors (see below), whose sum is σ = 643799520. Its totient is φ = 63349632.

The previous prime is 222288439. The next prime is 222288449. The reversal of 222288444 is 444882222.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (222288439) and next prime (222288449).

It is a super-2 number, since 2×222288444² = 98824304671882272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 222288399 and 222288408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222288449) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127402 + ... + 129134.

It is an arithmetic number, because the mean of its divisors is an integer number (8941660).

Almost surely, 2^222288444 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 222288444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321899760).

222288444 is an abundant number, since it is smaller than the sum of its proper divisors (421511076).

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

222288444 is a wasteful number, since it uses less digits than its factorization.

222288444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2259 (or 2254 counting only the distinct ones).

The product of its digits is 65536, while the sum is 36.

The square root of 222288444 is about 14909.3408304995. The cubic root of 222288444 is about 605.7670247799.

The spelling of 222288444 in words is "two hundred twenty-two million, two hundred eighty-eight thousand, four hundred forty-four".