1223533728 has 192 divisors, whose sum is σ = 3811651200. Its totient is φ = 380712960.

The previous prime is 1223533687. The next prime is 1223533763. The reversal of 1223533728 is 8273353221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1223533692 and 1223533701.

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 31 ways as a sum of consecutive naturals, for example, 1197858 + ... + 1198878.

It is an arithmetic number, because the mean of its divisors is an integer number (19852350).

Almost surely, 2^1223533728 is an apocalyptic number.

1223533728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1223533728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1905825600).

1223533728 is an abundant number, since it is smaller than the sum of its proper divisors (2588117472).

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

1223533728 is a wasteful number, since it uses less digits than its factorization.

1223533728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132 (or 1118 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 1223533728 is about 34979.0469853025. The cubic root of 1223533728 is about 1069.5604005473.

Adding to 1223533728 its reverse (8273353221), we get a palindrome (9496886949).

The spelling of 1223533728 in words is "one billion, two hundred twenty-three million, five hundred thirty-three thousand, seven hundred twenty-eight".