678568869 has 24 divisors (see below), whose sum is σ = 1125540000. Its totient is φ = 389607840.

The previous prime is 678568829. The next prime is 678568871. The reversal of 678568869 is 968865876.

678568869 is a `hidden beast` number, since 6 + 7 + 8 + 568 + 8 + 69 = 666.

It is not a de Polignac number, because 678568869 - 2⁸ = 678568613 is a prime.

It is a super-2 number, since 2×678568869² = 920911419951878322, which contains 22 as substring.

It is a Curzon number.

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678568829) 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 23 ways as a sum of consecutive naturals, for example, 178494 + ... + 182255.

It is an arithmetic number, because the mean of its divisors is an integer number (46897500).

Almost surely, 2^678568869 is an apocalyptic number.

It is an amenable number.

678568869 is a deficient number, since it is larger than the sum of its proper divisors (446971131).

678568869 is a wasteful number, since it uses less digits than its factorization.

678568869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 360785 (or 360782 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The square root of 678568869 is about 26049.3544833648. The cubic root of 678568869 is about 878.7485953356.

The spelling of 678568869 in words is "six hundred seventy-eight million, five hundred sixty-eight thousand, eight hundred sixty-nine".