687780859 has 2 divisors, whose sum is σ = 687780860. Its totient is φ = 687780858.

The previous prime is 687780853. The next prime is 687780889. The reversal of 687780859 is 958087786.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 687780859 - 2³ = 687780851 is a prime.

It is a super-3 number, since 3×687780859³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (687780851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343890429 + 343890430.

It is an arithmetic number, because the mean of its divisors is an integer number (343890430).

Almost surely, 2^687780859 is an apocalyptic number.

687780859 is a deficient number, since it is larger than the sum of its proper divisors (1).

687780859 is an equidigital number, since it uses as much as digits as its factorization.

687780859 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6773760, while the sum is 58.

The square root of 687780859 is about 26225.5764283647. The cubic root of 687780859 is about 882.7072529361.

The spelling of 687780859 in words is "six hundred eighty-seven million, seven hundred eighty thousand, eight hundred fifty-nine".