78515709684 has 24 divisors (see below), whose sum is σ = 191168685120. Its totient is φ = 25033994304.

The previous prime is 78515709683. The next prime is 78515709721. The reversal of 78515709684 is 48690751587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78515709683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142238329 + ... + 142238880.

It is an arithmetic number, because the mean of its divisors is an integer number (7965361880).

Almost surely, 2^78515709684 is an apocalyptic number.

It is an amenable number.

78515709684 is an abundant number, since it is smaller than the sum of its proper divisors (112652975436).

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

78515709684 is a wasteful number, since it uses less digits than its factorization.

78515709684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284477239 (or 284477237 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 60.

The spelling of 78515709684 in words is "seventy-eight billion, five hundred fifteen million, seven hundred nine thousand, six hundred eighty-four".