12663778 has 12 divisors (see below), whose sum is σ = 19675890. Its totient is φ = 6112736.

The previous prime is 12663769. The next prime is 12663787. The reversal of 12663778 is 87736621.

12663778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12663769) and next prime (12663787).

It can be written as a sum of positive squares in 3 ways, for example, as 10220809 + 2442969 = 3197^2 + 1563^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12663778.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2083 + ... + 5446.

Almost surely, 2^12663778 is an apocalyptic number.

12663778 is a deficient number, since it is larger than the sum of its proper divisors (7012112).

12663778 is an equidigital number, since it uses as much as digits as its factorization.

12663778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7589 (or 7560 counting only the distinct ones).

The product of its digits is 84672, while the sum is 40.

The square root of 12663778 is about 3558.6202382384. The cubic root of 12663778 is about 233.0886337196.

The spelling of 12663778 in words is "twelve million, six hundred sixty-three thousand, seven hundred seventy-eight".