687670777 has 2 divisors, whose sum is σ = 687670778. Its totient is φ = 687670776.

The previous prime is 687670769. The next prime is 687670829. The reversal of 687670777 is 777076786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 432182521 + 255488256 = 20789^2 + 15984^2 .

It is a cyclic number.

It is not a de Polignac number, because 687670777 - 2³ = 687670769 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (687676777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343835388 + 343835389.

It is an arithmetic number, because the mean of its divisors is an integer number (343835389).

Almost surely, 2^687670777 is an apocalyptic number.

It is an amenable number.

687670777 is a deficient number, since it is larger than the sum of its proper divisors (1).

687670777 is an equidigital number, since it uses as much as digits as its factorization.

687670777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4840416, while the sum is 55.

The square root of 687670777 is about 26223.4775916544. The cubic root of 687670777 is about 882.6601568477.

The spelling of 687670777 in words is "six hundred eighty-seven million, six hundred seventy thousand, seven hundred seventy-seven".