72339783668 has 12 divisors (see below), whose sum is σ = 126654098340. Its totient is φ = 36152898432.

The previous prime is 72339783667. The next prime is 72339783689. The reversal of 72339783668 is 86638793327.

It can be written as a sum of positive squares in 2 ways, for example, as 13338402064 + 59001381604 = 115492^2 + 242902^2 .

It is a super-2 number, since 2×72339783668² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72339783668.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72339783667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4238771 + ... + 4255802.

It is an arithmetic number, because the mean of its divisors is an integer number (10554508195).

Almost surely, 2^72339783668 is an apocalyptic number.

It is an amenable number.

72339783668 is a deficient number, since it is larger than the sum of its proper divisors (54314314672).

72339783668 is a wasteful number, since it uses less digits than its factorization.

72339783668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8496706 (or 8496704 counting only the distinct ones).

The product of its digits is 54867456, while the sum is 62.

The spelling of 72339783668 in words is "seventy-two billion, three hundred thirty-nine million, seven hundred eighty-three thousand, six hundred sixty-eight".