72539443768 has 64 divisors (see below), whose sum is σ = 157730872320. Its totient is φ = 30909120000.

The previous prime is 72539443747. The next prime is 72539443771. The reversal of 72539443768 is 86734493527.

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, 278905 + ... + 472087.

It is an arithmetic number, because the mean of its divisors is an integer number (2464544880).

Almost surely, 2^72539443768 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 72539443768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78865436160).

72539443768 is an abundant number, since it is smaller than the sum of its proper divisors (85191428552).

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

72539443768 is a wasteful number, since it uses less digits than its factorization.

72539443768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193468 (or 193464 counting only the distinct ones).

The product of its digits is 30481920, while the sum is 58.

It can be divided in two parts, 725 and 39443768, that added together give a palindrome (39444493).

The spelling of 72539443768 in words is "seventy-two billion, five hundred thirty-nine million, four hundred forty-three thousand, seven hundred sixty-eight".