22278369 has 8 divisors (see below), whose sum is σ = 29838592. Its totient is φ = 14785200.

The previous prime is 22278353. The next prime is 22278379. The reversal of 22278369 is 96387222.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22278369 - 2⁴ = 22278353 is a prime.

It is a super-2 number, since 2×22278369² = 992651450600322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22278379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15982 + ... + 17319.

It is an arithmetic number, because the mean of its divisors is an integer number (3729824).

Almost surely, 2^22278369 is an apocalyptic number.

It is an amenable number.

22278369 is a deficient number, since it is larger than the sum of its proper divisors (7560223).

22278369 is a wasteful number, since it uses less digits than its factorization.

22278369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33527.

The product of its digits is 72576, while the sum is 39.

The square root of 22278369 is about 4719.9967161006. The cubic root of 22278369 is about 281.3808027622.

The spelling of 22278369 in words is "twenty-two million, two hundred seventy-eight thousand, three hundred sixty-nine".