12688245 has 42 divisors (see below), whose sum is σ = 23221878. Its totient is φ = 6652368.

The previous prime is 12688243. The next prime is 12688297. The reversal of 12688245 is 54288621.

It can be written as a sum of positive squares in only one way, i.e., 10150596 + 2537649 = 3186^2 + 1593^2 .

It is not a de Polignac number, because 12688245 - 2¹ = 12688243 is a prime.

It is a super-2 number, since 2×12688245² = 321983122360050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12688241) by changing a digit.

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 41 ways as a sum of consecutive naturals, for example, 215026 + ... + 215084.

Almost surely, 2^12688245 is an apocalyptic number.

12688245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12688245 is a deficient number, since it is larger than the sum of its proper divisors (10533633).

12688245 is an frugal number, since it uses more digits than its factorization.

12688245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 67 counting only the distinct ones).

The product of its digits is 30720, while the sum is 36.

The square root of 12688245 is about 3562.0562881572. The cubic root of 12688245 is about 233.2386497925.

The spelling of 12688245 in words is "twelve million, six hundred eighty-eight thousand, two hundred forty-five".