67443411644 has 72 divisors (see below), whose sum is σ = 142518458880. Its totient is φ = 27815205600.

The previous prime is 67443411643. The next prime is 67443411647. The reversal of 67443411644 is 44611434476.

It is a super-2 number, since 2×67443411644² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 67443411595 and 67443411604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67443411641) 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, 1056599 + ... + 1118609.

It is an arithmetic number, because the mean of its divisors is an integer number (1979423040).

Almost surely, 2^67443411644 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 67443411644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71259229440).

67443411644 is an abundant number, since it is smaller than the sum of its proper divisors (75075047236).

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

67443411644 is a wasteful number, since it uses less digits than its factorization.

67443411644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62239 (or 62230 counting only the distinct ones).

The product of its digits is 774144, while the sum is 44.

The spelling of 67443411644 in words is "sixty-seven billion, four hundred forty-three million, four hundred eleven thousand, six hundred forty-four".