678669985 has 8 divisors (see below), whose sum is σ = 930747456. Its totient is φ = 465373680.

The previous prime is 678669983. The next prime is 678669991. The reversal of 678669985 is 589966876.

678669985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 678669985 - 2¹ = 678669983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (678669983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9695251 + ... + 9695320.

It is an arithmetic number, because the mean of its divisors is an integer number (116343432).

Almost surely, 2^678669985 is an apocalyptic number.

It is an amenable number.

678669985 is a deficient number, since it is larger than the sum of its proper divisors (252077471).

678669985 is a wasteful number, since it uses less digits than its factorization.

678669985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19390583.

The product of its digits is 39191040, while the sum is 64.

The square root of 678669985 is about 26051.2952653030. The cubic root of 678669985 is about 878.7922416693.

The spelling of 678669985 in words is "six hundred seventy-eight million, six hundred sixty-nine thousand, nine hundred eighty-five".