678728869 has 8 divisors (see below), whose sum is σ = 835358720. Its totient is φ = 537016176.

The previous prime is 678728867. The next prime is 678728881. The reversal of 678728869 is 968827876.

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 678728869 - 2¹ = 678728867 is a prime.

It is a super-2 number, since 2×678728869² = 921345755228038322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678728867) 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, 3729189 + ... + 3729370.

It is an arithmetic number, because the mean of its divisors is an integer number (104419840).

Almost surely, 2^678728869 is an apocalyptic number.

It is an amenable number.

678728869 is a deficient number, since it is larger than the sum of its proper divisors (156629851).

678728869 is a wasteful number, since it uses less digits than its factorization.

678728869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7458579.

The product of its digits is 16257024, while the sum is 61.

The square root of 678728869 is about 26052.4253957285. The cubic root of 678728869 is about 878.8176567247.

The spelling of 678728869 in words is "six hundred seventy-eight million, seven hundred twenty-eight thousand, eight hundred sixty-nine".