678507239 has 2 divisors, whose sum is σ = 678507240. Its totient is φ = 678507238.

The previous prime is 678507173. The next prime is 678507241. The reversal of 678507239 is 932705876.

678507239 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 is a cyclic number.

It is not a de Polignac number, because 678507239 - 2¹² = 678503143 is a prime.

Together with 678507241, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 678507193 and 678507202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678507299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339253619 + 339253620.

It is an arithmetic number, because the mean of its divisors is an integer number (339253620).

Almost surely, 2^678507239 is an apocalyptic number.

678507239 is a deficient number, since it is larger than the sum of its proper divisors (1).

678507239 is an equidigital number, since it uses as much as digits as its factorization.

678507239 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 678507239 is about 26048.1715097241. The cubic root of 678507239 is about 878.7219908557.

The spelling of 678507239 in words is "six hundred seventy-eight million, five hundred seven thousand, two hundred thirty-nine".