12561028 has 12 divisors (see below), whose sum is σ = 23274972. Its totient is φ = 5911040.

The previous prime is 12561023. The next prime is 12561061. The reversal of 12561028 is 82016521.

It can be written as a sum of positive squares in 2 ways, for example, as 10705984 + 1855044 = 3272^2 + 1362^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12560993 and 12561011.

It is not an unprimeable number, because it can be changed into a prime (12561023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92293 + ... + 92428.

It is an arithmetic number, because the mean of its divisors is an integer number (1939581).

Almost surely, 2^12561028 is an apocalyptic number.

It is an amenable number.

12561028 is a deficient number, since it is larger than the sum of its proper divisors (10713944).

12561028 is a wasteful number, since it uses less digits than its factorization.

12561028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184742 (or 184740 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 12561028 is about 3544.1540598569. The cubic root of 12561028 is about 232.4565178638.

Adding to 12561028 its reverse (82016521), we get a palindrome (94577549).

The spelling of 12561028 in words is "twelve million, five hundred sixty-one thousand, twenty-eight".