687222313 has 6 divisors (see below), whose sum is σ = 718401194. Its totient is φ = 657342576.

The previous prime is 687222307. The next prime is 687222323. The reversal of 687222313 is 313222786.

687222313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 668325904 + 18896409 = 25852^2 + 4347^2 .

It is not a de Polignac number, because 687222313 - 2²⁵ = 653667881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687222323) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 649020 + ... + 650077.

Almost surely, 2^687222313 is an apocalyptic number.

It is an amenable number.

687222313 is a deficient number, since it is larger than the sum of its proper divisors (31178881).

687222313 is a wasteful number, since it uses less digits than its factorization.

687222313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299143 (or 1299120 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 687222313 is about 26214.9253861231. The cubic root of 687222313 is about 882.4682397278.

The spelling of 687222313 in words is "six hundred eighty-seven million, two hundred twenty-two thousand, three hundred thirteen".