780439784985 has 48 divisors (see below), whose sum is σ = 1595885491200. Its totient is φ = 345263679360.

The previous prime is 780439784981. The next prime is 780439785089. The reversal of 780439784985 is 589487934087.

780439784985 is a `hidden beast` number, since 7 + 8 + 0 + 43 + 97 + 8 + 498 + 5 = 666.

It is not a de Polignac number, because 780439784985 - 2² = 780439784981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (780439784981) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 39951310 + ... + 39970839.

It is an arithmetic number, because the mean of its divisors is an integer number (33247614400).

Almost surely, 2^780439784985 is an apocalyptic number.

It is an amenable number.

780439784985 is an abundant number, since it is smaller than the sum of its proper divisors (815445706215).

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

780439784985 is a wasteful number, since it uses less digits than its factorization.

780439784985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79922198 (or 79922195 counting only the distinct ones).

The product of its (nonzero) digits is 487710720, while the sum is 72.

The spelling of 780439784985 in words is "seven hundred eighty billion, four hundred thirty-nine million, seven hundred eighty-four thousand, nine hundred eighty-five".