677949709 has 2 divisors, whose sum is σ = 677949710. Its totient is φ = 677949708.

The previous prime is 677949641. The next prime is 677949721. The reversal of 677949709 is 907949776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 629257225 + 48692484 = 25085^2 + 6978^2 .

It is a cyclic number.

It is not a de Polignac number, because 677949709 - 2⁷ = 677949581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (677919709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 338974854 + 338974855.

It is an arithmetic number, because the mean of its divisors is an integer number (338974855).

Almost surely, 2^677949709 is an apocalyptic number.

It is an amenable number.

677949709 is a deficient number, since it is larger than the sum of its proper divisors (1).

677949709 is an equidigital number, since it uses as much as digits as its factorization.

677949709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6001128, while the sum is 58.

The square root of 677949709 is about 26037.4674075648. The cubic root of 677949709 is about 878.4812426896.

The spelling of 677949709 in words is "six hundred seventy-seven million, nine hundred forty-nine thousand, seven hundred nine".