12778265 has 16 divisors (see below), whose sum is σ = 15918336. Its totient is φ = 9840000.

The previous prime is 12778253. The next prime is 12778277. The reversal of 12778265 is 56287721.

It is an interprime number because it is at equal distance from previous prime (12778253) and next prime (12778277).

It is not a de Polignac number, because 12778265 - 2⁶ = 12778201 is a prime.

It is a Duffinian number.

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 in 15 ways as a sum of consecutive naturals, for example, 16640 + ... + 17390.

It is an arithmetic number, because the mean of its divisors is an integer number (994896).

Almost surely, 2^12778265 is an apocalyptic number.

It is an amenable number.

12778265 is a deficient number, since it is larger than the sum of its proper divisors (3140071).

12778265 is an equidigital number, since it uses as much as digits as its factorization.

12778265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its digits is 47040, while the sum is 38.

The square root of 12778265 is about 3574.6699148313. The cubic root of 12778265 is about 233.7889408658.

The spelling of 12778265 in words is "twelve million, seven hundred seventy-eight thousand, two hundred sixty-five".