78345328727728 has 160 divisors (see below), whose sum is σ = 163612860678144. Its totient is φ = 36254534190336.

The previous prime is 78345328727719. The next prime is 78345328727741. The reversal of 78345328727728 is 82772782354387.

It is a super-2 number, since 2×78345328727728² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 901233801 + ... + 901320727.

Almost surely, 2^{78345328727728} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78345328727728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81806430339072).

78345328727728 is an abundant number, since it is smaller than the sum of its proper divisors (85267531950416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78345328727728 is a wasteful number, since it uses less digits than its factorization.

78345328727728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87599 (or 87593 counting only the distinct ones).

The product of its digits is 1770209280, while the sum is 73.

The spelling of 78345328727728 in words is "seventy-eight trillion, three hundred forty-five billion, three hundred twenty-eight million, seven hundred twenty-seven thousand, seven hundred twenty-eight".