687506873 has 2 divisors, whose sum is σ = 687506874. Its totient is φ = 687506872.

The previous prime is 687506861. The next prime is 687506921. The reversal of 687506873 is 378605786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 546063424 + 141443449 = 23368^2 + 11893^2 .

It is a cyclic number.

It is not a de Polignac number, because 687506873 - 2¹⁸ = 687244729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343753436 + 343753437.

It is an arithmetic number, because the mean of its divisors is an integer number (343753437).

Almost surely, 2^687506873 is an apocalyptic number.

It is an amenable number.

687506873 is a deficient number, since it is larger than the sum of its proper divisors (1).

687506873 is an equidigital number, since it uses as much as digits as its factorization.

687506873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1693440, while the sum is 50.

The square root of 687506873 is about 26220.3522668937. The cubic root of 687506873 is about 882.5900249228.

The spelling of 687506873 in words is "six hundred eighty-seven million, five hundred six thousand, eight hundred seventy-three".