680885687 has 2 divisors, whose sum is σ = 680885688. Its totient is φ = 680885686.

The previous prime is 680885659. The next prime is 680885701. The reversal of 680885687 is 786588086.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 680885687 - 2⁸ = 680885431 is a prime.

It is a super-2 number, since 2×680885687² = 927210637522923938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (680885627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 340442843 + 340442844.

It is an arithmetic number, because the mean of its divisors is an integer number (340442844).

Almost surely, 2^680885687 is an apocalyptic number.

680885687 is a deficient number, since it is larger than the sum of its proper divisors (1).

680885687 is an equidigital number, since it uses as much as digits as its factorization.

680885687 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5160960, while the sum is 56.

The square root of 680885687 is about 26093.7863676393. The cubic root of 680885687 is about 879.7475545680.

The spelling of 680885687 in words is "six hundred eighty million, eight hundred eighty-five thousand, six hundred eighty-seven".