72734238817 has 4 divisors (see below), whose sum is σ = 72736321300. Its totient is φ = 72732156336.

The previous prime is 72734238799. The next prime is 72734238821. The reversal of 72734238817 is 71883243727.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1172103696 + 71562135121 = 34236^2 + 267511^2 .

It is a cyclic number.

It is not a de Polignac number, because 72734238817 - 2¹¹ = 72734236769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72734238847) 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, 987942 + ... + 1059007.

It is an arithmetic number, because the mean of its divisors is an integer number (18184080325).

Almost surely, 2^72734238817 is an apocalyptic number.

It is an amenable number.

72734238817 is a deficient number, since it is larger than the sum of its proper divisors (2082483).

72734238817 is a wasteful number, since it uses less digits than its factorization.

72734238817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2082482.

The product of its digits is 3161088, while the sum is 52.

The spelling of 72734238817 in words is "seventy-two billion, seven hundred thirty-four million, two hundred thirty-eight thousand, eight hundred seventeen".