685456985 has 8 divisors (see below), whose sum is σ = 836490240. Its totient is φ = 539071024.

The previous prime is 685456951. The next prime is 685456987. The reversal of 685456985 is 589654586.

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

It is a cyclic number.

It is not a de Polignac number, because 685456985 - 2¹⁰ = 685455961 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 685456985.

It is not an unprimeable number, because it can be changed into a prime (685456987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161497 + ... + 1162086.

It is an arithmetic number, because the mean of its divisors is an integer number (104561280).

Almost surely, 2^685456985 is an apocalyptic number.

It is an amenable number.

685456985 is a deficient number, since it is larger than the sum of its proper divisors (151033255).

685456985 is a wasteful number, since it uses less digits than its factorization.

685456985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2323647.

The product of its digits is 10368000, while the sum is 56.

The square root of 685456985 is about 26181.2334506990. The cubic root of 685456985 is about 881.7119673663.

The spelling of 685456985 in words is "six hundred eighty-five million, four hundred fifty-six thousand, nine hundred eighty-five".