12778267 has 4 divisors (see below), whose sum is σ = 13075480. Its totient is φ = 12481056.

The previous prime is 12778253. The next prime is 12778277. The reversal of 12778267 is 76287721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12778277) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 148542 + ... + 148627.

It is an arithmetic number, because the mean of its divisors is an integer number (3268870).

Almost surely, 2^12778267 is an apocalyptic number.

12778267 is a deficient number, since it is larger than the sum of its proper divisors (297213).

12778267 is an equidigital number, since it uses as much as digits as its factorization.

12778267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297212.

The product of its digits is 65856, while the sum is 40.

The square root of 12778267 is about 3574.6701945774. The cubic root of 12778267 is about 233.7889530630.

The spelling of 12778267 in words is "twelve million, seven hundred seventy-eight thousand, two hundred sixty-seven".