12782563 has 4 divisors (see below), whose sum is σ = 12914440. Its totient is φ = 12650688.

The previous prime is 12782513. The next prime is 12782599. The reversal of 12782563 is 36528721.

It is a happy number.

12782563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36528721 = 137 ⋅266633.

It is a cyclic number.

It is not a de Polignac number, because 12782563 - 2¹⁷ = 12651491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12782513) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65793 + ... + 65986.

It is an arithmetic number, because the mean of its divisors is an integer number (3228610).

Almost surely, 2^12782563 is an apocalyptic number.

12782563 is a deficient number, since it is larger than the sum of its proper divisors (131877).

12782563 is an equidigital number, since it uses as much as digits as its factorization.

12782563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131876.

The product of its digits is 20160, while the sum is 34.

The square root of 12782563 is about 3575.2710386766. The cubic root of 12782563 is about 233.8151497507.

The spelling of 12782563 in words is "twelve million, seven hundred eighty-two thousand, five hundred sixty-three".