12781828 has 6 divisors (see below), whose sum is σ = 22368206. Its totient is φ = 6390912.

The previous prime is 12781823. The next prime is 12781843. The reversal of 12781828 is 82818721.

It can be written as a sum of positive squares in only one way, i.e., 8749764 + 4032064 = 2958^2 + 2008^2 .

It is not an unprimeable number, because it can be changed into a prime (12781823) 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, 1597725 + ... + 1597732.

Almost surely, 2^12781828 is an apocalyptic number.

It is an amenable number.

12781828 is a deficient number, since it is larger than the sum of its proper divisors (9586378).

12781828 is a wasteful number, since it uses less digits than its factorization.

12781828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3195461 (or 3195459 counting only the distinct ones).

The product of its digits is 14336, while the sum is 37.

The square root of 12781828 is about 3575.1682477892. The cubic root of 12781828 is about 233.8106681917.

The spelling of 12781828 in words is "twelve million, seven hundred eighty-one thousand, eight hundred twenty-eight".