12778563 has 12 divisors (see below), whose sum is σ = 19820040. Its totient is φ = 7301952.

The previous prime is 12778561. The next prime is 12778627. The reversal of 12778563 is 36587721.

12778563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12778563 - 2¹ = 12778561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778561) 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, 43318 + ... + 43611.

It is an arithmetic number, because the mean of its divisors is an integer number (1651670).

Almost surely, 2^12778563 is an apocalyptic number.

12778563 is a deficient number, since it is larger than the sum of its proper divisors (7041477).

12778563 is an equidigital number, since it uses as much as digits as its factorization.

12778563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86946 (or 86939 counting only the distinct ones).

The product of its digits is 70560, while the sum is 39.

The square root of 12778563 is about 3574.7115967585. The cubic root of 12778563 is about 233.7907582372.

The spelling of 12778563 in words is "twelve million, seven hundred seventy-eight thousand, five hundred sixty-three".