677678809 has 2 divisors, whose sum is σ = 677678810. Its totient is φ = 677678808.

The previous prime is 677678801. The next prime is 677678849. The reversal of 677678809 is 908876776.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 356265625 + 321413184 = 18875^2 + 17928^2 .

It is a cyclic number.

It is not a de Polignac number, because 677678809 - 2³ = 677678801 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (677678801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338839404 + 338839405.

It is an arithmetic number, because the mean of its divisors is an integer number (338839405).

Almost surely, 2^677678809 is an apocalyptic number.

It is an amenable number.

677678809 is a deficient number, since it is larger than the sum of its proper divisors (1).

677678809 is an equidigital number, since it uses as much as digits as its factorization.

677678809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7112448, while the sum is 58.

The square root of 677678809 is about 26032.2647689363. The cubic root of 677678809 is about 878.3642171588.

The spelling of 677678809 in words is "six hundred seventy-seven million, six hundred seventy-eight thousand, eight hundred nine".