222220278 has 48 divisors (see below), whose sum is σ = 554501376. Its totient is φ = 63002160.

The previous prime is 222220253. The next prime is 222220279. The reversal of 222220278 is 872022222.

222220278 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222220279) 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, 9775 + ... + 23237.

It is an arithmetic number, because the mean of its divisors is an integer number (11552112).

Almost surely, 2^222220278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222220278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277250688).

222220278 is an abundant number, since it is smaller than the sum of its proper divisors (332281098).

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

222220278 is a wasteful number, since it uses less digits than its factorization.

222220278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13609 (or 13606 counting only the distinct ones).

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

The square root of 222220278 is about 14907.0546386602. The cubic root of 222220278 is about 605.7050978291.

It can be divided in two parts, 2222 and 20278, that added together give a square (22500 = 150²).

The spelling of 222220278 in words is "two hundred twenty-two million, two hundred twenty thousand, two hundred seventy-eight".