12778224 has 80 divisors (see below), whose sum is σ = 34831104. Its totient is φ = 4032000.

The previous prime is 12778201. The next prime is 12778229. The reversal of 12778224 is 42287721.

It is a super-4 number, since 4×12778224⁴ (a number of 30 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778229) 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 15 ways as a sum of consecutive naturals, for example, 84549 + ... + 84699.

Almost surely, 2^12778224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12778224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17415552).

12778224 is an abundant number, since it is smaller than the sum of its proper divisors (22052880).

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

12778224 is a wasteful number, since it uses less digits than its factorization.

12778224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 240 counting only the distinct ones).

The product of its digits is 12544, while the sum is 33.

The square root of 12778224 is about 3574.6641800315. The cubic root of 12778224 is about 233.7886908225.

The spelling of 12778224 in words is "twelve million, seven hundred seventy-eight thousand, two hundred twenty-four".