12228678 has 128 divisors (see below), whose sum is σ = 36080640. Its totient is φ = 2972160.

The previous prime is 12228677. The next prime is 12228679. The reversal of 12228678 is 87682221.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12228677) and next prime (12228679).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12228677) 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 63 ways as a sum of consecutive naturals, for example, 70600 + ... + 70772.

It is an arithmetic number, because the mean of its divisors is an integer number (281880).

Almost surely, 2^12228678 is an apocalyptic number.

12228678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12228678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18040320).

12228678 is an abundant number, since it is smaller than the sum of its proper divisors (23851962).

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

12228678 is a wasteful number, since it uses less digits than its factorization.

12228678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219 (or 213 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 12228678 is about 3496.9526734001. The cubic root of 12228678 is about 230.3879903679.

The spelling of 12228678 in words is "twelve million, two hundred twenty-eight thousand, six hundred seventy-eight".