678812371 has 2 divisors, whose sum is σ = 678812372. Its totient is φ = 678812370.

The previous prime is 678812311. The next prime is 678812377. The reversal of 678812371 is 173218876.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678812371 is a prime.

It is not a weakly prime, because it can be changed into another prime (678812377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339406185 + 339406186.

It is an arithmetic number, because the mean of its divisors is an integer number (339406186).

Almost surely, 2^678812371 is an apocalyptic number.

678812371 is a deficient number, since it is larger than the sum of its proper divisors (1).

678812371 is an equidigital number, since it uses as much as digits as its factorization.

678812371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 43.

The square root of 678812371 is about 26054.0279227608. The cubic root of 678812371 is about 878.8536946902.

The spelling of 678812371 in words is "six hundred seventy-eight million, eight hundred twelve thousand, three hundred seventy-one".