78105312968520 has 128 divisors (see below), whose sum is σ = 234499830243840. Its totient is φ = 20811740421120.

The previous prime is 78105312968467. The next prime is 78105312968549. The reversal of 78105312968520 is 2586921350187.

It is a super-2 number, since 2×78105312968520² (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, 3004384162 + ... + 3004410158.

It is an arithmetic number, because the mean of its divisors is an integer number (1832029923780).

Almost surely, 2^{78105312968520} is an apocalyptic number.

It is an amenable number.

78105312968520 is an abundant number, since it is smaller than the sum of its proper divisors (156394517275320).

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

78105312968520 is a wasteful number, since it uses less digits than its factorization.

78105312968520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44695 (or 44691 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 57.

The spelling of 78105312968520 in words is "seventy-eight trillion, one hundred five billion, three hundred twelve million, nine hundred sixty-eight thousand, five hundred twenty".