678704869 has 2 divisors, whose sum is σ = 678704870. Its totient is φ = 678704868.

The previous prime is 678704827. The next prime is 678704911. The reversal of 678704869 is 968407876.

678704869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (678704827) and next prime (678704911).

It can be written as a sum of positive squares in only one way, i.e., 577440900 + 101263969 = 24030^2 + 10063^2 .

It is a cyclic number.

It is not a de Polignac number, because 678704869 - 2¹¹ = 678702821 is a prime.

It is a super-2 number, since 2×678704869² = 921280598408614322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678704809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339352434 + 339352435.

It is an arithmetic number, because the mean of its divisors is an integer number (339352435).

Almost surely, 2^678704869 is an apocalyptic number.

It is an amenable number.

678704869 is a deficient number, since it is larger than the sum of its proper divisors (1).

678704869 is an equidigital number, since it uses as much as digits as its factorization.

678704869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4064256, while the sum is 55.

The square root of 678704869 is about 26051.9647819507. The cubic root of 678704869 is about 878.8072982083.

The spelling of 678704869 in words is "six hundred seventy-eight million, seven hundred four thousand, eight hundred sixty-nine".