687811218 has 16 divisors (see below), whose sum is σ = 1377544320. Its totient is φ = 228950096.

The previous prime is 687811217. The next prime is 687811247. The reversal of 687811218 is 812118786.

It is a self number, because there is not a number n which added to its sum of digits gives 687811218.

It is not an unprimeable number, because it can be changed into a prime (687811217) 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, 75405 + ... + 84032.

It is an arithmetic number, because the mean of its divisors is an integer number (86096520).

Almost surely, 2^687811218 is an apocalyptic number.

687811218 is an abundant number, since it is smaller than the sum of its proper divisors (689733102).

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

687811218 is a wasteful number, since it uses less digits than its factorization.

687811218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160161.

The product of its digits is 43008, while the sum is 42.

The square root of 687811218 is about 26226.1552271773. The cubic root of 687811218 is about 882.7202404621.

The spelling of 687811218 in words is "six hundred eighty-seven million, eight hundred eleven thousand, two hundred eighteen".