687720168 has 48 divisors (see below), whose sum is σ = 1902214080. Its totient is φ = 224361504.

The previous prime is 687720167. The next prime is 687720191. The reversal of 687720168 is 861027786.

It is not an unprimeable number, because it can be changed into a prime (687720167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 98230 + ... + 104997.

It is an arithmetic number, because the mean of its divisors is an integer number (39629460).

Almost surely, 2^687720168 is an apocalyptic number.

It is an amenable number.

687720168 is an abundant number, since it is smaller than the sum of its proper divisors (1214493912).

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

687720168 is a wasteful number, since it uses less digits than its factorization.

687720168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203286 (or 203279 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 687720168 is about 26224.4193072030. The cubic root of 687720168 is about 882.6812882891.

The spelling of 687720168 in words is "six hundred eighty-seven million, seven hundred twenty thousand, one hundred sixty-eight".