678203489 has 2 divisors, whose sum is σ = 678203490. Its totient is φ = 678203488.

The previous prime is 678203473. The next prime is 678203497. The reversal of 678203489 is 984302876.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 626651089 + 51552400 = 25033^2 + 7180^2 .

It is a cyclic number.

It is not a de Polignac number, because 678203489 - 2⁴ = 678203473 is a prime.

It is not a weakly prime, because it can be changed into another prime (678203189) 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, 339101744 + 339101745.

It is an arithmetic number, because the mean of its divisors is an integer number (339101745).

Almost surely, 2^678203489 is an apocalyptic number.

It is an amenable number.

678203489 is a deficient number, since it is larger than the sum of its proper divisors (1).

678203489 is an equidigital number, since it uses as much as digits as its factorization.

678203489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 678203489 is about 26042.3403134204. The cubic root of 678203489 is about 878.5908443087.

The spelling of 678203489 in words is "six hundred seventy-eight million, two hundred three thousand, four hundred eighty-nine".