72705779288 has 16 divisors (see below), whose sum is σ = 137529739080. Its totient is φ = 36031182208.

The previous prime is 72705779287. The next prime is 72705779291. The reversal of 72705779288 is 88297750727.

It is a super-2 number, since 2×72705779288² (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 72705779288.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72705779287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40212470 + ... + 40214277.

Almost surely, 2^72705779288 is an apocalyptic number.

It is an amenable number.

72705779288 is a deficient number, since it is larger than the sum of its proper divisors (64823959792).

72705779288 is a wasteful number, since it uses less digits than its factorization.

72705779288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80426866 (or 80426862 counting only the distinct ones).

The product of its (nonzero) digits is 27659520, while the sum is 62.

The spelling of 72705779288 in words is "seventy-two billion, seven hundred five million, seven hundred seventy-nine thousand, two hundred eighty-eight".