678984359769 has 12 divisors (see below), whose sum is σ = 1038446668116. Its totient is φ = 426029402112.

The previous prime is 678984359759. The next prime is 678984359777. The reversal of 678984359769 is 967953489876.

678984359769 is a `hidden beast` number, since 6 + 7 + 8 + 98 + 435 + 97 + 6 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 566652134169 + 112332225600 = 752763^2 + 335160^2 .

It is not a de Polignac number, because 678984359769 - 2²³ = 678975971161 is a prime.

It is a super-2 number, since 2×678984359769² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (678984359759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2218902984 + ... + 2218903289.

It is an arithmetic number, because the mean of its divisors is an integer number (86537222343).

Almost surely, 2^678984359769 is an apocalyptic number.

It is an amenable number.

678984359769 is a deficient number, since it is larger than the sum of its proper divisors (359462308347).

678984359769 is a wasteful number, since it uses less digits than its factorization.

678984359769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4437806296 (or 4437806293 counting only the distinct ones).

The product of its digits is 4938071040, while the sum is 81.

The spelling of 678984359769 in words is "six hundred seventy-eight billion, nine hundred eighty-four million, three hundred fifty-nine thousand, seven hundred sixty-nine".