687070073 has 2 divisors, whose sum is σ = 687070074. Its totient is φ = 687070072.

The previous prime is 687070067. The next prime is 687070091. The reversal of 687070073 is 370070786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 657563449 + 29506624 = 25643^2 + 5432^2 .

It is a cyclic number.

It is not a de Polignac number, because 687070073 - 2¹⁰ = 687069049 is a prime.

It is not a weakly prime, because it can be changed into another prime (687070673) 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, 343535036 + 343535037.

It is an arithmetic number, because the mean of its divisors is an integer number (343535037).

Almost surely, 2^687070073 is an apocalyptic number.

It is an amenable number.

687070073 is a deficient number, since it is larger than the sum of its proper divisors (1).

687070073 is an equidigital number, since it uses as much as digits as its factorization.

687070073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 38.

The square root of 687070073 is about 26212.0215359289. The cubic root of 687070073 is about 882.4030706725.

The spelling of 687070073 in words is "six hundred eighty-seven million, seventy thousand, seventy-three".