1323122728 has 16 divisors (see below), whose sum is σ = 2538550080. Its totient is φ = 646176048.

The previous prime is 1323122659. The next prime is 1323122747. The reversal of 1323122728 is 8272213231.

It is a self number, because there is not a number n which added to its sum of digits gives 1323122728.

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, 1922800 + ... + 1923487.

It is an arithmetic number, because the mean of its divisors is an integer number (158659380).

Almost surely, 2^1323122728 is an apocalyptic number.

It is an amenable number.

1323122728 is a deficient number, since it is larger than the sum of its proper divisors (1215427352).

1323122728 is a wasteful number, since it uses less digits than its factorization.

1323122728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846336 (or 3846332 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 1323122728 is about 36374.7539922953. The cubic root of 1323122728 is about 1097.8256574804.

Adding to 1323122728 its reverse (8272213231), we get a palindrome (9595335959).

The spelling of 1323122728 in words is "one billion, three hundred twenty-three million, one hundred twenty-two thousand, seven hundred twenty-eight".