12628661 has 4 divisors (see below), whose sum is σ = 12662892. Its totient is φ = 12594432.

The previous prime is 12628657. The next prime is 12628669. The reversal of 12628661 is 16682621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16682621 = 179 ⋅93199.

It can be written as a sum of positive squares in 2 ways, for example, as 10923025 + 1705636 = 3305^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 12628661 - 2² = 12628657 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12628669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16556 + ... + 17301.

It is an arithmetic number, because the mean of its divisors is an integer number (3165723).

Almost surely, 2^12628661 is an apocalyptic number.

It is an amenable number.

12628661 is a deficient number, since it is larger than the sum of its proper divisors (34231).

12628661 is an equidigital number, since it uses as much as digits as its factorization.

12628661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34230.

The product of its digits is 6912, while the sum is 32.

The square root of 12628661 is about 3553.6827376681. The cubic root of 12628661 is about 232.8729805573.

The spelling of 12628661 in words is "twelve million, six hundred twenty-eight thousand, six hundred sixty-one".