687601073 has 2 divisors, whose sum is σ = 687601074. Its totient is φ = 687601072.

The previous prime is 687601067. The next prime is 687601097. The reversal of 687601073 is 370106786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 660644209 + 26956864 = 25703^2 + 5192^2 .

It is a cyclic number.

It is not a de Polignac number, because 687601073 - 2¹⁸ = 687338929 is a prime.

It is not a weakly prime, because it can be changed into another prime (687601573) 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, 343800536 + 343800537.

It is an arithmetic number, because the mean of its divisors is an integer number (343800537).

Almost surely, 2^687601073 is an apocalyptic number.

It is an amenable number.

687601073 is a deficient number, since it is larger than the sum of its proper divisors (1).

687601073 is an equidigital number, since it uses as much as digits as its factorization.

687601073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 687601073 is about 26222.1485199058. The cubic root of 687601073 is about 882.6303329724.

The spelling of 687601073 in words is "six hundred eighty-seven million, six hundred one thousand, seventy-three".