687222 has 24 divisors (see below), whose sum is σ = 1512264. Its totient is φ = 225504.

The previous prime is 687179. The next prime is 687223. The reversal of 687222 is 222786.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687222.

It is not an unprimeable number, because it can be changed into a prime (687223) by changing a digit.

687222 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1053 + ... + 1575.

It is an arithmetic number, because the mean of its divisors is an integer number (63011).

2⁶⁸⁷²²² is an apocalyptic number.

687222 is an abundant number, since it is smaller than the sum of its proper divisors (825042).

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

687222 is a wasteful number, since it uses less digits than its factorization.

687222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 601 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 687222 is about 828.9885403309. The cubic root of 687222 is about 88.2468105752.

It can be divided in two parts, 687 and 222, that added together give a palindrome (909).

The spelling of 687222 in words is "six hundred eighty-seven thousand, two hundred twenty-two".