1222233728 has 64 divisors (see below), whose sum is σ = 2510756520. Its totient is φ = 592220160.

The previous prime is 1222233709. The next prime is 1222233737. The reversal of 1222233728 is 8273322221.

It can be written as a sum of positive squares in 4 ways, for example, as 487173184 + 735060544 = 22072^2 + 27112^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1222233694 and 1222233703.

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 7 ways as a sum of consecutive naturals, for example, 1993550 + ... + 1994162.

Almost surely, 2^1222233728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1222233728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1255378260).

1222233728 is an abundant number, since it is smaller than the sum of its proper divisors (1288522792).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1222233728 is an equidigital number, since it uses as much as digits as its factorization.

1222233728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1085 (or 1073 counting only the distinct ones).

The product of its digits is 16128, while the sum is 32.

The square root of 1222233728 is about 34960.4594935479. The cubic root of 1222233728 is about 1069.1814650042.

Adding to 1222233728 its reverse (8273322221), we get a palindrome (9495555949).

The spelling of 1222233728 in words is "one billion, two hundred twenty-two million, two hundred thirty-three thousand, seven hundred twenty-eight".