22278225 has 24 divisors (see below), whose sum is σ = 37115680. Its totient is φ = 11790720.

The previous prime is 22278197. The next prime is 22278227. The reversal of 22278225 is 52287222.

It is not a de Polignac number, because 22278225 - 2¹⁶ = 22212689 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22278192 and 22278201.

It is not an unprimeable number, because it can be changed into a prime (22278227) 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, 9357 + ... + 11493.

Almost surely, 2^22278225 is an apocalyptic number.

22278225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22278225 is a deficient number, since it is larger than the sum of its proper divisors (14837455).

22278225 is a wasteful number, since it uses less digits than its factorization.

22278225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2289 (or 2284 counting only the distinct ones).

The product of its digits is 8960, while the sum is 30.

The square root of 22278225 is about 4719.9814618280. The cubic root of 22278225 is about 281.3801965101.

The spelling of 22278225 in words is "twenty-two million, two hundred seventy-eight thousand, two hundred twenty-five".