677779209 has 12 divisors (see below), whose sum is σ = 1005474756. Its totient is φ = 439640352.

The previous prime is 677779199. The next prime is 677779237. The reversal of 677779209 is 902977776.

It can be written as a sum of positive squares in 2 ways, for example, as 627652809 + 50126400 = 25053^2 + 7080^2 .

It is not a de Polignac number, because 677779209 - 2⁸ = 677778953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (677779259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017354 + ... + 1018019.

It is an arithmetic number, because the mean of its divisors is an integer number (83789563).

Almost surely, 2^677779209 is an apocalyptic number.

It is an amenable number.

677779209 is a deficient number, since it is larger than the sum of its proper divisors (327695547).

677779209 is a wasteful number, since it uses less digits than its factorization.

677779209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2035416 (or 2035413 counting only the distinct ones).

The product of its (nonzero) digits is 2333772, while the sum is 54.

The square root of 677779209 is about 26034.1930737252. The cubic root of 677779209 is about 878.4075923839.

The spelling of 677779209 in words is "six hundred seventy-seven million, seven hundred seventy-nine thousand, two hundred nine".