78345328727729 has 32 divisors (see below), whose sum is σ = 94303770720000. Its totient is φ = 63582489057024.

The previous prime is 78345328727719. The next prime is 78345328727741. The reversal of 78345328727729 is 92772782354387.

It is not a de Polignac number, because 78345328727729 - 2²⁴ = 78345311950513 is a prime.

It is a super-2 number, since 2×78345328727729² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78345328727719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3326895047 + ... + 3326918595.

It is an arithmetic number, because the mean of its divisors is an integer number (2946992835000).

Almost surely, 2^{78345328727729} is an apocalyptic number.

It is an amenable number.

78345328727729 is a deficient number, since it is larger than the sum of its proper divisors (15958441992271).

78345328727729 is a wasteful number, since it uses less digits than its factorization.

78345328727729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36777.

The product of its digits is 1991485440, while the sum is 74.

The spelling of 78345328727729 in words is "seventy-eight trillion, three hundred forty-five billion, three hundred twenty-eight million, seven hundred twenty-seven thousand, seven hundred twenty-nine".