12778005 has 16 divisors (see below), whose sum is σ = 20571264. Its totient is φ = 6772800.

The previous prime is 12778001. The next prime is 12778021. The reversal of 12778005 is 50087721.

It is a happy number.

12778005 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12778005 - 2² = 12778001 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 46 + ... + 5055.

It is an arithmetic number, because the mean of its divisors is an integer number (1285704).

Almost surely, 2^12778005 is an apocalyptic number.

12778005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12778005 is a deficient number, since it is larger than the sum of its proper divisors (7793259).

12778005 is a wasteful number, since it uses less digits than its factorization.

12778005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5276.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 12778005 is about 3574.6335476521. The cubic root of 12778005 is about 233.7873552166.

The spelling of 12778005 in words is "twelve million, seven hundred seventy-eight thousand, five".