687710213 has 4 divisors (see below), whose sum is σ = 688445100. Its totient is φ = 686975328.

The previous prime is 687710183. The next prime is 687710227. The reversal of 687710213 is 312017786.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 337346689 + 350363524 = 18367^2 + 18718^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-687710213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687710113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366038 + ... + 367911.

It is an arithmetic number, because the mean of its divisors is an integer number (172111275).

Almost surely, 2^687710213 is an apocalyptic number.

It is an amenable number.

687710213 is a deficient number, since it is larger than the sum of its proper divisors (734887).

687710213 is an equidigital number, since it uses as much as digits as its factorization.

687710213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734886.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 687710213 is about 26224.2295025040. The cubic root of 687710213 is about 882.6770292241.

Adding to 687710213 its reverse (312017786), we get a palindrome (999727999).

The spelling of 687710213 in words is "six hundred eighty-seven million, seven hundred ten thousand, two hundred thirteen".