687600857 has 2 divisors, whose sum is σ = 687600858. Its totient is φ = 687600856.

The previous prime is 687600841. The next prime is 687600877. The reversal of 687600857 is 758006786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 644093641 + 43507216 = 25379^2 + 6596^2 .

It is a cyclic number.

It is not a de Polignac number, because 687600857 - 2⁴ = 687600841 is a prime.

It is not a weakly prime, because it can be changed into another prime (687600877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343800428 + 343800429.

It is an arithmetic number, because the mean of its divisors is an integer number (343800429).

Almost surely, 2^687600857 is an apocalyptic number.

It is an amenable number.

687600857 is a deficient number, since it is larger than the sum of its proper divisors (1).

687600857 is an equidigital number, since it uses as much as digits as its factorization.

687600857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 47.

The square root of 687600857 is about 26222.1444012499. The cubic root of 687600857 is about 882.6302405505.

The spelling of 687600857 in words is "six hundred eighty-seven million, six hundred thousand, eight hundred fifty-seven".