12278778 has 8 divisors (see below), whose sum is σ = 24557568. Its totient is φ = 4092924.

The previous prime is 12278767. The next prime is 12278789. The reversal of 12278778 is 87787221.

It is an interprime number because it is at equal distance from previous prime (12278767) and next prime (12278789).

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

12278778 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1023226 + ... + 1023237.

It is an arithmetic number, because the mean of its divisors is an integer number (3069696).

Almost surely, 2^12278778 is an apocalyptic number.

12278778 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.

12278778 is a wasteful number, since it uses less digits than its factorization.

12278778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2046468.

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

The square root of 12278778 is about 3504.1087311897. The cubic root of 12278778 is about 230.7021892605.

The spelling of 12278778 in words is "twelve million, two hundred seventy-eight thousand, seven hundred seventy-eight".