12880928 has 12 divisors (see below), whose sum is σ = 25359390. Its totient is φ = 6440448.

The previous prime is 12880927. The next prime is 12880949. The reversal of 12880928 is 82908821.

It can be written as a sum of positive squares in only one way, i.e., 8832784 + 4048144 = 2972^2 + 2012^2 .

It is a super-2 number, since 2×12880928² = 331836612282368, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12880891 and 12880900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12880927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201233 + ... + 201296.

Almost surely, 2^12880928 is an apocalyptic number.

It is an amenable number.

12880928 is a deficient number, since it is larger than the sum of its proper divisors (12478462).

12880928 is an equidigital number, since it uses as much as digits as its factorization.

12880928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402539 (or 402531 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 12880928 is about 3589.0009752019. Note that the first 3 decimals coincide. The cubic root of 12880928 is about 234.4133731066.

The spelling of 12880928 in words is "twelve million, eight hundred eighty thousand, nine hundred twenty-eight".