12778689 has 48 divisors (see below), whose sum is σ = 22063104. Its totient is φ = 6436320.

The previous prime is 12778681. The next prime is 12778691. The reversal of 12778689 is 98687721.

12778689 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 12778689 - 2³ = 12778681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12778681) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 119374 + ... + 119480.

It is an arithmetic number, because the mean of its divisors is an integer number (459648).

Almost surely, 2^12778689 is an apocalyptic number.

It is an amenable number.

12778689 is a deficient number, since it is larger than the sum of its proper divisors (9284415).

12778689 is a wasteful number, since it uses less digits than its factorization.

12778689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 175 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 12778689 is about 3574.7292205145. The cubic root of 12778689 is about 233.7915266476.

The spelling of 12778689 in words is "twelve million, seven hundred seventy-eight thousand, six hundred eighty-nine".