78515935512 has 128 divisors (see below), whose sum is σ = 229119321600. Its totient is φ = 21957608448.

The previous prime is 78515935501. The next prime is 78515935513. The reversal of 78515935512 is 21553951587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78515935513) 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, 2292498 + ... + 2326494.

It is an arithmetic number, because the mean of its divisors is an integer number (1789994700).

Almost surely, 2^78515935512 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 78515935512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114559660800).

78515935512 is an abundant number, since it is smaller than the sum of its proper divisors (150603386088).

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

78515935512 is a wasteful number, since it uses less digits than its factorization.

78515935512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34305 (or 34301 counting only the distinct ones).

The product of its digits is 1890000, while the sum is 51.

The spelling of 78515935512 in words is "seventy-eight billion, five hundred fifteen million, nine hundred thirty-five thousand, five hundred twelve".