22278660 has 24 divisors (see below), whose sum is σ = 62380416. Its totient is φ = 5940960.

The previous prime is 22278643. The next prime is 22278661. The reversal of 22278660 is 6687222.

It is not an unprimeable number, because it can be changed into a prime (22278661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 185596 + ... + 185715.

It is an arithmetic number, because the mean of its divisors is an integer number (2599184).

Almost surely, 2^22278660 is an apocalyptic number.

22278660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

22278660 is an abundant number, since it is smaller than the sum of its proper divisors (40101756).

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

22278660 is a wasteful number, since it uses less digits than its factorization.

22278660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371323 (or 371321 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 22278660 is about 4720.0275422925. The cubic root of 22278660 is about 281.3820278887.

The spelling of 22278660 in words is "twenty-two million, two hundred seventy-eight thousand, six hundred sixty".