1123421568 has 128 divisors (see below), whose sum is σ = 3131481600. Its totient is φ = 356167680.

The previous prime is 1123421539. The next prime is 1123421573. The reversal of 1123421568 is 8651243211.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2746548 + ... + 2746956.

It is an arithmetic number, because the mean of its divisors is an integer number (24464700).

Almost surely, 2^1123421568 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 1123421568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1565740800).

1123421568 is an abundant number, since it is smaller than the sum of its proper divisors (2008060032).

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

1123421568 is a wasteful number, since it uses less digits than its factorization.

1123421568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 748 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

The square root of 1123421568 is about 33517.4815283010. The cubic root of 1123421568 is about 1039.5552733632. Note that the first 3 decimals are identical.

Adding to 1123421568 its reverse (8651243211), we get a palindrome (9774664779).

The spelling of 1123421568 in words is "one billion, one hundred twenty-three million, four hundred twenty-one thousand, five hundred sixty-eight".