12630778 has 4 divisors (see below), whose sum is σ = 18946170. Its totient is φ = 6315388.

The previous prime is 12630769. The next prime is 12630799. The reversal of 12630778 is 87703621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87703621 = 1307 ⋅67103.

It can be written as a sum of positive squares in only one way, i.e., 12510369 + 120409 = 3537^2 + 347^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3157693 + ... + 3157696.

Almost surely, 2^12630778 is an apocalyptic number.

12630778 is a deficient number, since it is larger than the sum of its proper divisors (6315392).

12630778 is an equidigital number, since it uses as much as digits as its factorization.

12630778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6315391.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 12630778 is about 3553.9805852030. The cubic root of 12630778 is about 232.8859923499.

The spelling of 12630778 in words is "twelve million, six hundred thirty thousand, seven hundred seventy-eight".