678984769 has 4 divisors (see below), whose sum is σ = 682778160. Its totient is φ = 675191380.

The previous prime is 678984739. The next prime is 678984773. The reversal of 678984769 is 967489876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 678984769 - 2¹¹ = 678982721 is a prime.

It is a super-2 number, since 2×678984769² = 922040633067966722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 678984769.

It is not an unprimeable number, because it can be changed into a prime (678984739) 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 3 ways as a sum of consecutive naturals, for example, 1896427 + ... + 1896784.

It is an arithmetic number, because the mean of its divisors is an integer number (170694540).

Almost surely, 2^678984769 is an apocalyptic number.

It is an amenable number.

678984769 is a deficient number, since it is larger than the sum of its proper divisors (3793391).

678984769 is a wasteful number, since it uses less digits than its factorization.

678984769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3793390.

The product of its digits is 36578304, while the sum is 64.

The square root of 678984769 is about 26057.3361838850. The cubic root of 678984769 is about 878.9280892264.

The spelling of 678984769 in words is "six hundred seventy-eight million, nine hundred eighty-four thousand, seven hundred sixty-nine".