678519073 has 2 divisors, whose sum is σ = 678519074. Its totient is φ = 678519072.

The previous prime is 678519029. The next prime is 678519109. The reversal of 678519073 is 370915876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 676364049 + 2155024 = 26007^2 + 1468^2 .

It is a cyclic number.

It is not a de Polignac number, because 678519073 - 2¹⁷ = 678388001 is a prime.

It is not a weakly prime, because it can be changed into another prime (678519173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339259536 + 339259537.

It is an arithmetic number, because the mean of its divisors is an integer number (339259537).

Almost surely, 2^678519073 is an apocalyptic number.

It is an amenable number.

678519073 is a deficient number, since it is larger than the sum of its proper divisors (1).

678519073 is an equidigital number, since it uses as much as digits as its factorization.

678519073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 46.

The square root of 678519073 is about 26048.3986647932. The cubic root of 678519073 is about 878.7270994897.

The spelling of 678519073 in words is "six hundred seventy-eight million, five hundred nineteen thousand, seventy-three".