12780128 has 12 divisors (see below), whose sum is σ = 25160940. Its totient is φ = 6390048.

The previous prime is 12780127. The next prime is 12780139. The reversal of 12780128 is 82108721.

It is a self number, because there is not a number n which added to its sum of digits gives 12780128.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12780121) 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, 199658 + ... + 199721.

It is an arithmetic number, because the mean of its divisors is an integer number (2096745).

Almost surely, 2^12780128 is an apocalyptic number.

It is an amenable number.

12780128 is a deficient number, since it is larger than the sum of its proper divisors (12380812).

12780128 is an equidigital number, since it uses as much as digits as its factorization.

12780128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399389 (or 399381 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12780128 is about 3574.9304888347. The cubic root of 12780128 is about 233.8003020230.

Adding to 12780128 its reverse (82108721), we get a palindrome (94888849).

The spelling of 12780128 in words is "twelve million, seven hundred eighty thousand, one hundred twenty-eight".