12720266 has 8 divisors (see below), whose sum is σ = 20548164. Its totient is φ = 5870880.

The previous prime is 12720247. The next prime is 12720271. The reversal of 12720266 is 66202721.

It can be written as a sum of positive squares in 2 ways, for example, as 9030025 + 3690241 = 3005^2 + 1921^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12720266² = 323610334221512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 489241 = 12720266 / (1 + 2 + 7 + 2 + 0 + 2 + 6 + 6).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244595 + ... + 244646.

Almost surely, 2^12720266 is an apocalyptic number.

12720266 is a deficient number, since it is larger than the sum of its proper divisors (7827898).

12720266 is a wasteful number, since it uses less digits than its factorization.

12720266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489256.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 12720266 is about 3566.5481911787. The cubic root of 12720266 is about 233.4346911122.

Adding to 12720266 its reverse (66202721), we get a palindrome (78922987).

The spelling of 12720266 in words is "twelve million, seven hundred twenty thousand, two hundred sixty-six".