685220700588 has 12 divisors (see below), whose sum is σ = 1598848301400. Its totient is φ = 228406900192.

The previous prime is 685220700569. The next prime is 685220700589. The reversal of 685220700588 is 885007022586.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 685220700588.

It is not an unprimeable number, because it can be changed into a prime (685220700589) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28550862513 + ... + 28550862536.

It is an arithmetic number, because the mean of its divisors is an integer number (133237358450).

Almost surely, 2^685220700588 is an apocalyptic number.

It is an amenable number.

685220700588 is an abundant number, since it is smaller than the sum of its proper divisors (913627600812).

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

685220700588 is a wasteful number, since it uses less digits than its factorization.

685220700588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57101725056 (or 57101725054 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 51.

The spelling of 685220700588 in words is "six hundred eighty-five billion, two hundred twenty million, seven hundred thousand, five hundred eighty-eight".