12678505 has 12 divisors (see below), whose sum is σ = 17698500. Its totient is φ = 8693664.

The previous prime is 12678493. The next prime is 12678509. The reversal of 12678505 is 50587621.

12678505 is digitally balanced in base 2, 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 2 ways, for example, as 6744409 + 5934096 = 2597^2 + 2436^2 .

It is not a de Polignac number, because 12678505 - 2⁹ = 12677993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12678509) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25630 + ... + 26119.

It is an arithmetic number, because the mean of its divisors is an integer number (1474875).

Almost surely, 2^12678505 is an apocalyptic number.

It is an amenable number.

12678505 is a deficient number, since it is larger than the sum of its proper divisors (5019995).

12678505 is an equidigital number, since it uses as much as digits as its factorization.

12678505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51768 (or 51761 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 12678505 is about 3560.6888378515. The cubic root of 12678505 is about 233.1789534360.

The spelling of 12678505 in words is "twelve million, six hundred seventy-eight thousand, five hundred five".