1213773568 has 54 divisors (see below), whose sum is σ = 2772289464. Its totient is φ = 519556608.

The previous prime is 1213773563. The next prime is 1213773571. The reversal of 1213773568 is 8653773121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213773563) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1474405 + ... + 1475227.

Almost surely, 2^1213773568 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 1213773568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1386144732).

1213773568 is an abundant number, since it is smaller than the sum of its proper divisors (1558515896).

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

1213773568 is an frugal number, since it uses more digits than its factorization.

1213773568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1669 (or 832 counting only the distinct ones).

The product of its digits is 211680, while the sum is 43.

The square root of 1213773568 is about 34839.2532640985. The cubic root of 1213773568 is about 1066.7088344441.

The spelling of 1213773568 in words is "one billion, two hundred thirteen million, seven hundred seventy-three thousand, five hundred sixty-eight".