12688280 has 32 divisors (see below), whose sum is σ = 31145040. Its totient is φ = 4613760.

The previous prime is 12688243. The next prime is 12688297. The reversal of 12688280 is 8288621.

It is a self number, because there is not a number n which added to its sum of digits gives 12688280.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 13979 + ... + 14858.

Almost surely, 2^12688280 is an apocalyptic number.

12688280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12688280 is an abundant number, since it is smaller than the sum of its proper divisors (18456760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12688280 is a wasteful number, since it uses less digits than its factorization.

12688280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28859 (or 28855 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 12688280 is about 3562.0612010464. The cubic root of 12688280 is about 233.2388642520.

The spelling of 12688280 in words is "twelve million, six hundred eighty-eight thousand, two hundred eighty".