8443138068 has 72 divisors (see below), whose sum is σ = 22274015400. Its totient is φ = 2693246976.

The previous prime is 8443138063. The next prime is 8443138079. The reversal of 8443138068 is 8608313448.

8443138068 is a `hidden beast` number, since 84 + 431 + 3 + 80 + 68 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 452923524 + 7990214544 = 21282^2 + 89388^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8443138063) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82188 + ... + 153756.

It is an arithmetic number, because the mean of its divisors is an integer number (309361325).

Almost surely, 2^8443138068 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 8443138068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11137007700).

8443138068 is an abundant number, since it is smaller than the sum of its proper divisors (13830877332).

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

8443138068 is a wasteful number, since it uses less digits than its factorization.

8443138068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71721 (or 71716 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The square root of 8443138068 is about 91886.5499842061. The cubic root of 8443138068 is about 2036.2665654406.

The spelling of 8443138068 in words is "eight billion, four hundred forty-three million, one hundred thirty-eight thousand, sixty-eight".