678846787 has 2 divisors, whose sum is σ = 678846788. Its totient is φ = 678846786.

The previous prime is 678846781. The next prime is 678846793. The reversal of 678846787 is 787648876.

It is a balanced prime because it is at equal distance from previous prime (678846781) and next prime (678846793).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-678846787 is a prime.

It is not a weakly prime, because it can be changed into another prime (678846781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339423393 + 339423394.

It is an arithmetic number, because the mean of its divisors is an integer number (339423394).

Almost surely, 2^678846787 is an apocalyptic number.

678846787 is a deficient number, since it is larger than the sum of its proper divisors (1).

678846787 is an equidigital number, since it uses as much as digits as its factorization.

678846787 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25288704, while the sum is 61.

The square root of 678846787 is about 26054.6883880809. The cubic root of 678846787 is about 878.8685471585.

The spelling of 678846787 in words is "six hundred seventy-eight million, eight hundred forty-six thousand, seven hundred eighty-seven".