78847340890920 has 128 divisors (see below), whose sum is σ = 270339909661440. Its totient is φ = 18021838049280.

The previous prime is 78847340890919. The next prime is 78847340890931. The reversal of 78847340890920 is 2909804374887.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

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, 36543810 + ... + 38641230.

It is an arithmetic number, because the mean of its divisors is an integer number (2112030544230).

Almost surely, 2^{78847340890920} is an apocalyptic number.

78847340890920 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78847340890920 is an abundant number, since it is smaller than the sum of its proper divisors (191492568770520).

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

78847340890920 is a wasteful number, since it uses less digits than its factorization.

78847340890920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142195 (or 2142191 counting only the distinct ones).

The product of its (nonzero) digits is 195084288, while the sum is 69.

The spelling of 78847340890920 in words is "seventy-eight trillion, eight hundred forty-seven billion, three hundred forty million, eight hundred ninety thousand, nine hundred twenty".