22222278 has 48 divisors (see below), whose sum is σ = 54119520. Its totient is φ = 6538752.

The previous prime is 22222273. The next prime is 22222327. The reversal of 22222278 is 87222222.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22222273) 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, 3318 + ... + 7446.

It is an arithmetic number, because the mean of its divisors is an integer number (1127490).

Almost surely, 2^22222278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22222278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27059760).

22222278 is an abundant number, since it is smaller than the sum of its proper divisors (31897242).

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

22222278 is a wasteful number, since it uses less digits than its factorization.

22222278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173 (or 4170 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

The square root of 22222278 is about 4714.0511240333. The cubic root of 22222278 is about 281.1444569911.

It can be divided in two parts, 22222 and 278, that multiplied together give a palindrome (6177716).

The spelling of 22222278 in words is "twenty-two million, two hundred twenty-two thousand, two hundred seventy-eight".