12678345 has 24 divisors (see below), whose sum is σ = 23269896. Its totient is φ = 6363648.

The previous prime is 12678299. The next prime is 12678353. The reversal of 12678345 is 54387621.

12678345 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3606201 + 9072144 = 1899^2 + 3012^2 .

It is not a de Polignac number, because 12678345 - 2⁸ = 12678089 is a prime.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 7522 + ... + 9051.

It is an arithmetic number, because the mean of its divisors is an integer number (969579).

Almost surely, 2^12678345 is an apocalyptic number.

12678345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12678345 is a deficient number, since it is larger than the sum of its proper divisors (10591551).

12678345 is a wasteful number, since it uses less digits than its factorization.

12678345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16601 (or 16598 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 12678345 is about 3560.6663702178. Note that the first 3 decimals coincide. The cubic root of 12678345 is about 233.1779725425.

Subtracting from 12678345 its product of digits (40320), we obtain a square (12638025 = 3555²).

The spelling of 12678345 in words is "twelve million, six hundred seventy-eight thousand, three hundred forty-five".