12778278 has 8 divisors (see below), whose sum is σ = 25556568. Its totient is φ = 4259424.

The previous prime is 12778277. The next prime is 12778289. The reversal of 12778278 is 87287721.

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

12778278 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778277) 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 3 ways as a sum of consecutive naturals, for example, 1064851 + ... + 1064862.

It is an arithmetic number, because the mean of its divisors is an integer number (3194571).

Almost surely, 2^12778278 is an apocalyptic number.

12778278 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

12778278 is a wasteful number, since it uses less digits than its factorization.

12778278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2129718.

The product of its digits is 87808, while the sum is 42.

The square root of 12778278 is about 3574.6717331805. The cubic root of 12778278 is about 233.7890201477.

The spelling of 12778278 in words is "twelve million, seven hundred seventy-eight thousand, two hundred seventy-eight".