684502085 has 8 divisors (see below), whose sum is σ = 821590776. Its totient is φ = 547476160.

The previous prime is 684502043. The next prime is 684502087. The reversal of 684502085 is 580205486.

It can be written as a sum of positive squares in 4 ways, for example, as 233661796 + 450840289 = 15286^2 + 21233^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 684502085 - 2¹⁰ = 684501061 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684502087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13115 + ... + 39255.

It is an arithmetic number, because the mean of its divisors is an integer number (102698847).

Almost surely, 2^684502085 is an apocalyptic number.

It is an amenable number.

684502085 is a deficient number, since it is larger than the sum of its proper divisors (137088691).

684502085 is a wasteful number, since it uses less digits than its factorization.

684502085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31383.

The product of its (nonzero) digits is 76800, while the sum is 38.

The square root of 684502085 is about 26162.9907502946. The cubic root of 684502085 is about 881.3023437882.

The spelling of 684502085 in words is "six hundred eighty-four million, five hundred two thousand, eighty-five".