678842243 has 2 divisors, whose sum is σ = 678842244. Its totient is φ = 678842242.

The previous prime is 678842239. The next prime is 678842303. The reversal of 678842243 is 342248876.

It is a happy number.

678842243 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 678842243 - 2² = 678842239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678842194 and 678842203.

It is not a weakly prime, because it can be changed into another prime (678842233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339421121 + 339421122.

It is an arithmetic number, because the mean of its divisors is an integer number (339421122).

Almost surely, 2^678842243 is an apocalyptic number.

678842243 is a deficient number, since it is larger than the sum of its proper divisors (1).

678842243 is an equidigital number, since it uses as much as digits as its factorization.

678842243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 516096, while the sum is 44.

The square root of 678842243 is about 26054.6011867386. The cubic root of 678842243 is about 878.8665861919.

The spelling of 678842243 in words is "six hundred seventy-eight million, eight hundred forty-two thousand, two hundred forty-three".