22278 has 16 divisors (see below), whose sum is σ = 46080. Its totient is φ = 7176.

The previous prime is 22277. The next prime is 22279. The reversal of 22278 is 87222.

It is an interprime number because it is at equal distance from previous prime (22277) and next prime (22279).

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 (22271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 243 + ... + 321.

It is an arithmetic number, because the mean of its divisors is an integer number (2880).

2²²²⁷⁸ is an apocalyptic number.

22278 is an abundant number, since it is smaller than the sum of its proper divisors (23802).

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

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23040).

22278 is a wasteful number, since it uses less digits than its factorization.

22278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131.

The product of its digits is 448, while the sum is 21.

The square root of 22278 is about 149.2581656058. The cubic root of 22278 is about 28.1379249236.

It can be divided in two parts, 222 and 78, that added together give a triangular number (300 = T₂₄).

The spelling of 22278 in words is "twenty-two thousand, two hundred seventy-eight".