12820028 has 12 divisors (see below), whose sum is σ = 24160920. Its totient is φ = 5916912.

The previous prime is 12820009. The next prime is 12820033. The reversal of 12820028 is 82002821.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 12819985 and 12820012.

It is a congruent number.

It is an unprimeable number.

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, 123218 + ... + 123321.

It is an arithmetic number, because the mean of its divisors is an integer number (2013410).

Almost surely, 2^12820028 is an apocalyptic number.

It is an amenable number.

12820028 is a deficient number, since it is larger than the sum of its proper divisors (11340892).

12820028 is a wasteful number, since it uses less digits than its factorization.

12820028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246556 (or 246554 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 12820028 is about 3580.5066680569. The cubic root of 12820028 is about 234.0433601194.

Subtracting from 12820028 its product of nonzero digits (512), we obtain a triangular number (12819516 = T₅₀₆₃).

Adding to 12820028 its reverse (82002821), we get a palindrome (94822849).

The spelling of 12820028 in words is "twelve million, eight hundred twenty thousand, twenty-eight".