78020908720 has 20 divisors (see below), whose sum is σ = 181398612960. Its totient is φ = 31208363456.

The previous prime is 78020908711. The next prime is 78020908741. The reversal of 78020908720 is 2780902087.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487630600 + ... + 487630759.

It is an arithmetic number, because the mean of its divisors is an integer number (9069930648).

Almost surely, 2^78020908720 is an apocalyptic number.

It is an amenable number.

78020908720 is an abundant number, since it is smaller than the sum of its proper divisors (103377704240).

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

78020908720 is a wasteful number, since it uses less digits than its factorization.

78020908720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975261372 (or 975261366 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 78020908720 in words is "seventy-eight billion, twenty million, nine hundred eight thousand, seven hundred twenty".