687243967 has 2 divisors, whose sum is σ = 687243968. Its totient is φ = 687243966.

The previous prime is 687243961. The next prime is 687243971. The reversal of 687243967 is 769342786.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 687243967 - 2³ = 687243959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687243961) 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, 343621983 + 343621984.

It is an arithmetic number, because the mean of its divisors is an integer number (343621984).

Almost surely, 2^687243967 is an apocalyptic number.

687243967 is a deficient number, since it is larger than the sum of its proper divisors (1).

687243967 is an equidigital number, since it uses as much as digits as its factorization.

687243967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 52.

The square root of 687243967 is about 26215.3383918652. The cubic root of 687243967 is about 882.4775083280.

The spelling of 687243967 in words is "six hundred eighty-seven million, two hundred forty-three thousand, nine hundred sixty-seven".