687872873 has 2 divisors, whose sum is σ = 687872874. Its totient is φ = 687872872.

The previous prime is 687872869. The next prime is 687872897. The reversal of 687872873 is 378278786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405901609 + 281971264 = 20147^2 + 16792^2 .

It is a cyclic number.

It is not a de Polignac number, because 687872873 - 2² = 687872869 is a prime.

It is not a weakly prime, because it can be changed into another prime (687872813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343936436 + 343936437.

It is an arithmetic number, because the mean of its divisors is an integer number (343936437).

Almost surely, 2^687872873 is an apocalyptic number.

It is an amenable number.

687872873 is a deficient number, since it is larger than the sum of its proper divisors (1).

687872873 is an equidigital number, since it uses as much as digits as its factorization.

687872873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6322176, while the sum is 56.

The square root of 687872873 is about 26227.3306495343. The cubic root of 687872873 is about 882.7466151847.

The spelling of 687872873 in words is "six hundred eighty-seven million, eight hundred seventy-two thousand, eight hundred seventy-three".