22222222 has 32 divisors (see below), whose sum is σ = 37498464.
Its totient is φ = 9792000.
The previous prime is 22222199. The next prime is 22222223.
It is a happy number.
22222222 is nontrivially palindromic in base 10.
It is a nude number because it is divisible by every one of its digits.
22222222 is a modest number, since divided by 22222 gives 222 as remainder.
22222222 is a nontrivial repdigit in base 10.
It is a plaindrome in base 10.
It is a nialpdrome in base 10.
It is a zygodrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 22222196 and 22222205.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (22222223) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162138 + ... + 162274.
It is an arithmetic number, because the mean of its divisors is an integer number (1171827).
Almost surely, 222222222 is an apocalyptic number.
22222222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.
22222222 is a deficient number, since it is larger than the sum of its proper divisors (15276242).
22222222 is a wasteful number, since it uses less digits than its factorization.
22222222 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 324.
The product of its digits is 256, while the sum is 16.
The square root of 22222222 is about 4714.0451843401.
The cubic root of 22222222 is about 281.1442208301.
It can be divided in two parts, 2222222 and 2, that multiplied together give a palindrome (4444444).
The spelling of 22222222 in words is "twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".