678900109 has 2 divisors, whose sum is σ = 678900110. Its totient is φ = 678900108.

The previous prime is 678900071. The next prime is 678900113. The reversal of 678900109 is 901009876.

678900109 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 677144484 + 1755625 = 26022^2 + 1325^2 .

It is a cyclic number.

It is not a de Polignac number, because 678900109 - 2¹⁷ = 678769037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678900119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339450054 + 339450055.

It is an arithmetic number, because the mean of its divisors is an integer number (339450055).

Almost surely, 2^678900109 is an apocalyptic number.

It is an amenable number.

678900109 is a deficient number, since it is larger than the sum of its proper divisors (1).

678900109 is an equidigital number, since it uses as much as digits as its factorization.

678900109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 678900109 is about 26055.7116387175. The cubic root of 678900109 is about 878.8915576535.

The spelling of 678900109 in words is "six hundred seventy-eight million, nine hundred thousand, one hundred nine".