78520313884 has 24 divisors (see below), whose sum is σ = 138846839040. Its totient is φ = 38849903616.

The previous prime is 78520313869. The next prime is 78520313897. The reversal of 78520313884 is 48831302587.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4833744 + ... + 4849960.

It is an arithmetic number, because the mean of its divisors is an integer number (5785284960).

Almost surely, 2^78520313884 is an apocalyptic number.

It is an amenable number.

78520313884 is a deficient number, since it is larger than the sum of its proper divisors (60326525156).

78520313884 is a wasteful number, since it uses less digits than its factorization.

78520313884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28797 (or 28795 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 49.

The spelling of 78520313884 in words is "seventy-eight billion, five hundred twenty million, three hundred thirteen thousand, eight hundred eighty-four".