12758645 has 4 divisors (see below), whose sum is σ = 15310380. Its totient is φ = 10206912.

The previous prime is 12758621. The next prime is 12758663. The reversal of 12758645 is 54685721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54685721 = 863 ⋅63367.

It can be written as a sum of positive squares in 2 ways, for example, as 1623076 + 11135569 = 1274^2 + 3337^2 .

It is a cyclic number.

It is not a de Polignac number, because 12758645 - 2¹⁰ = 12757621 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12758599 and 12758608.

It is a congruent number.

It is an unprimeable number.

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, 1275860 + ... + 1275869.

It is an arithmetic number, because the mean of its divisors is an integer number (3827595).

Almost surely, 2^12758645 is an apocalyptic number.

It is an amenable number.

12758645 is a deficient number, since it is larger than the sum of its proper divisors (2551735).

12758645 is an equidigital number, since it uses as much as digits as its factorization.

12758645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2551734.

The product of its digits is 67200, while the sum is 38.

The square root of 12758645 is about 3571.9245512748. The cubic root of 12758645 is about 233.6692248571.

The spelling of 12758645 in words is "twelve million, seven hundred fifty-eight thousand, six hundred forty-five".