12706778 has 16 divisors (see below), whose sum is σ = 22228800. Its totient is φ = 5445468.

The previous prime is 12706777. The next prime is 12706781. The reversal of 12706778 is 87760721.

It is a super-2 number, since 2×12706778² = 322924414282568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12706777) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 8576 + ... + 9947.

It is an arithmetic number, because the mean of its divisors is an integer number (1389300).

Almost surely, 2^12706778 is an apocalyptic number.

12706778 is a deficient number, since it is larger than the sum of its proper divisors (9522022).

12706778 is an equidigital number, since it uses as much as digits as its factorization.

12706778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18546 (or 18532 counting only the distinct ones).

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 12706778 is about 3564.6567857229. The cubic root of 12706778 is about 233.3521540374.

The spelling of 12706778 in words is "twelve million, seven hundred six thousand, seven hundred seventy-eight".