1213923568 has 80 divisors (see below), whose sum is σ = 2771822592. Its totient is φ = 507744000.

The previous prime is 1213923553. The next prime is 1213923589. The reversal of 1213923568 is 8653293121.

It is a super-2 number, since 2×1213923568² = 2947220857891701248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1213923568.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 985513 + ... + 986743.

Almost surely, 2^1213923568 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 1213923568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1385911296).

1213923568 is an abundant number, since it is smaller than the sum of its proper divisors (1557899024).

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

1213923568 is a wasteful number, since it uses less digits than its factorization.

1213923568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1688 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 1213923568 is about 34841.4059417814. The cubic root of 1213923568 is about 1066.7527744723.

The spelling of 1213923568 in words is "one billion, two hundred thirteen million, nine hundred twenty-three thousand, five hundred sixty-eight".