678344599 has 2 divisors, whose sum is σ = 678344600. Its totient is φ = 678344598.

The previous prime is 678344587. The next prime is 678344609. The reversal of 678344599 is 995443876.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 678344599 - 2¹⁷ = 678213527 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (678344399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 339172299 + 339172300.

It is an arithmetic number, because the mean of its divisors is an integer number (339172300).

Almost surely, 2^678344599 is an apocalyptic number.

678344599 is a deficient number, since it is larger than the sum of its proper divisors (1).

678344599 is an equidigital number, since it uses as much as digits as its factorization.

678344599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6531840, while the sum is 55.

The square root of 678344599 is about 26045.0494144281. The cubic root of 678344599 is about 878.6517745745.

The spelling of 678344599 in words is "six hundred seventy-eight million, three hundred forty-four thousand, five hundred ninety-nine".