684522785 has 24 divisors (see below), whose sum is σ = 881289576. Its totient is φ = 510209280.

The previous prime is 684522781. The next prime is 684522793. The reversal of 684522785 is 587225486.

684522785 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 13868176 + 670654609 = 3724^2 + 25897^2 .

It is not a de Polignac number, because 684522785 - 2² = 684522781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684522781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106997 + ... + 113213.

It is an arithmetic number, because the mean of its divisors is an integer number (36720399).

Almost surely, 2^684522785 is an apocalyptic number.

It is an amenable number.

684522785 is a deficient number, since it is larger than the sum of its proper divisors (196766791).

684522785 is a wasteful number, since it uses less digits than its factorization.

684522785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6321 (or 6302 counting only the distinct ones).

The product of its digits is 1075200, while the sum is 47.

The square root of 684522785 is about 26163.3863442789. The cubic root of 684522785 is about 881.3112275083.

The spelling of 684522785 in words is "six hundred eighty-four million, five hundred twenty-two thousand, seven hundred eighty-five".