12728266 has 4 divisors (see below), whose sum is σ = 19092402. Its totient is φ = 6364132.

The previous prime is 12728263. The next prime is 12728267. The reversal of 12728266 is 66282721.

12728266 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 11758041 + 970225 = 3429^2 + 985^2 .

It is not an unprimeable number, because it can be changed into a prime (12728263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3182065 + ... + 3182068.

Almost surely, 2^12728266 is an apocalyptic number.

12728266 is a deficient number, since it is larger than the sum of its proper divisors (6364136).

12728266 is an equidigital number, since it uses as much as digits as its factorization.

12728266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6364135.

The product of its digits is 16128, while the sum is 34.

The square root of 12728266 is about 3567.6695474777. The cubic root of 12728266 is about 233.4836179236.

The spelling of 12728266 in words is "twelve million, seven hundred twenty-eight thousand, two hundred sixty-six".