12655278 has 40 divisors (see below), whose sum is σ = 28575360. Its totient is φ = 4186080.

The previous prime is 12655277. The next prime is 12655303. The reversal of 12655278 is 87255621.

It is a happy number.

12655278 is a `hidden beast` number, since 126 + 5 + 527 + 8 = 666.

It is a super-2 number, since 2×12655278² = 320312122514568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12655277) 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 19 ways as a sum of consecutive naturals, for example, 30738 + ... + 31146.

It is an arithmetic number, because the mean of its divisors is an integer number (714384).

Almost surely, 2^12655278 is an apocalyptic number.

12655278 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 12655278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14287680).

12655278 is an abundant number, since it is smaller than the sum of its proper divisors (15920082).

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

12655278 is a wasteful number, since it uses less digits than its factorization.

12655278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614 (or 605 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 12655278 is about 3557.4257546715. The cubic root of 12655278 is about 233.0364719074.

The spelling of 12655278 in words is "twelve million, six hundred fifty-five thousand, two hundred seventy-eight".