687371807 has 2 divisors, whose sum is σ = 687371808. Its totient is φ = 687371806.

The previous prime is 687371791. The next prime is 687371849. The reversal of 687371807 is 708173786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687371807 - 2⁴ = 687371791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687371857) 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, 343685903 + 343685904.

It is an arithmetic number, because the mean of its divisors is an integer number (343685904).

Almost surely, 2^687371807 is an apocalyptic number.

687371807 is a deficient number, since it is larger than the sum of its proper divisors (1).

687371807 is an equidigital number, since it uses as much as digits as its factorization.

687371807 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 395136, while the sum is 47.

The square root of 687371807 is about 26217.7765456951. The cubic root of 687371807 is about 882.5322239435.

The spelling of 687371807 in words is "six hundred eighty-seven million, three hundred seventy-one thousand, eight hundred seven".