72768721727 has 4 divisors (see below), whose sum is σ = 78366315720. Its totient is φ = 67171127736.

The previous prime is 72768721723. The next prime is 72768721843. The reversal of 72768721727 is 72712786727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72768721727 - 2² = 72768721723 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72768721723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798796977 + ... + 2798797002.

It is an arithmetic number, because the mean of its divisors is an integer number (19591578930).

Almost surely, 2^72768721727 is an apocalyptic number.

72768721727 is a deficient number, since it is larger than the sum of its proper divisors (5597593993).

72768721727 is a wasteful number, since it uses less digits than its factorization.

72768721727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5597593992.

The product of its digits is 6453888, while the sum is 56.

The spelling of 72768721727 in words is "seventy-two billion, seven hundred sixty-eight million, seven hundred twenty-one thousand, seven hundred twenty-seven".