12780556 has 12 divisors (see below), whose sum is σ = 23087680. Its totient is φ = 6184080.

The previous prime is 12780553. The next prime is 12780557. The reversal of 12780556 is 65508721.

It is a super-2 number, since 2×12780556² = 326685223338272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780553) 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 in 3 ways as a sum of consecutive naturals, for example, 51411 + ... + 51658.

Almost surely, 2^12780556 is an apocalyptic number.

It is an amenable number.

12780556 is a deficient number, since it is larger than the sum of its proper divisors (10307124).

12780556 is a wasteful number, since it uses less digits than its factorization.

12780556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103104 (or 103102 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 12780556 is about 3574.9903496373. The cubic root of 12780556 is about 233.8029119450.

The spelling of 12780556 in words is "twelve million, seven hundred eighty thousand, five hundred fifty-six".