1223612544 has 256 divisors, whose sum is σ = 4194892800. Its totient is φ = 306647040.

The previous prime is 1223612543. The next prime is 1223612549. The reversal of 1223612544 is 4452163221.

It is not an unprimeable number, because it can be changed into a prime (1223612543) 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 31 ways as a sum of consecutive naturals, for example, 856759 + ... + 858185.

It is an arithmetic number, because the mean of its divisors is an integer number (16386300).

Almost surely, 2^1223612544 is an apocalyptic number.

1223612544 is a gapful number since it is divisible by the number (14) 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 1223612544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2097446400).

1223612544 is an abundant number, since it is smaller than the sum of its proper divisors (2971280256).

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

1223612544 is a wasteful number, since it uses less digits than its factorization.

1223612544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1491 (or 1479 counting only the distinct ones).

The product of its digits is 11520, while the sum is 30.

The square root of 1223612544 is about 34980.1735844750. The cubic root of 1223612544 is about 1069.5833659032.

Adding to 1223612544 its reverse (4452163221), we get a palindrome (5675775765).

The spelling of 1223612544 in words is "one billion, two hundred twenty-three million, six hundred twelve thousand, five hundred forty-four".