677729609 has 2 divisors, whose sum is σ = 677729610. Its totient is φ = 677729608.

The previous prime is 677729561. The next prime is 677729651. The reversal of 677729609 is 906927776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 564775225 + 112954384 = 23765^2 + 10628^2 .

It is a cyclic number.

It is not a de Polignac number, because 677729609 - 2²⁴ = 660952393 is a prime.

It is not a weakly prime, because it can be changed into another prime (677729659) 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, 338864804 + 338864805.

It is an arithmetic number, because the mean of its divisors is an integer number (338864805).

Almost surely, 2^677729609 is an apocalyptic number.

It is an amenable number.

677729609 is a deficient number, since it is larger than the sum of its proper divisors (1).

677729609 is an equidigital number, since it uses as much as digits as its factorization.

677729609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000376, while the sum is 53.

The square root of 677729609 is about 26033.2404629159. The cubic root of 677729609 is about 878.3861645212.

The spelling of 677729609 in words is "six hundred seventy-seven million, seven hundred twenty-nine thousand, six hundred nine".