687313212 has 24 divisors (see below), whose sum is σ = 1604803200. Its totient is φ = 228951216.

The previous prime is 687313199. The next prime is 687313219. The reversal of 687313212 is 212313786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687313219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 339 + ... + 37077.

It is an arithmetic number, because the mean of its divisors is an integer number (66866800).

Almost surely, 2^687313212 is an apocalyptic number.

It is an amenable number.

687313212 is an abundant number, since it is smaller than the sum of its proper divisors (917489988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687313212 is a wasteful number, since it uses less digits than its factorization.

687313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38305 (or 38303 counting only the distinct ones).

The product of its digits is 12096, while the sum is 33.

The square root of 687313212 is about 26216.6590548834. The cubic root of 687313212 is about 882.5071460819.

Adding to 687313212 its reverse (212313786), we get a palindrome (899626998).

The spelling of 687313212 in words is "six hundred eighty-seven million, three hundred thirteen thousand, two hundred twelve".