22278320 has 20 divisors (see below), whose sum is σ = 51797280. Its totient is φ = 8911296.

The previous prime is 22278307. The next prime is 22278323. The reversal of 22278320 is 2387222.

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 22278320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22278323) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139160 + ... + 139319.

It is an arithmetic number, because the mean of its divisors is an integer number (2589864).

Almost surely, 2^22278320 is an apocalyptic number.

22278320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22278320 is an abundant number, since it is smaller than the sum of its proper divisors (29518960).

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

22278320 is a wasteful number, since it uses less digits than its factorization.

22278320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278492 (or 278486 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 22278320 is about 4719.9915254161. The cubic root of 22278320 is about 281.3805964684.

The spelling of 22278320 in words is "twenty-two million, two hundred seventy-eight thousand, three hundred twenty".