687228 has 12 divisors (see below), whose sum is σ = 1603560. Its totient is φ = 229072.

The previous prime is 687223. The next prime is 687233. The reversal of 687228 is 822786.

It is an interprime number because it is at equal distance from previous prime (687223) and next prime (687233).

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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

687228 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 3 ways as a sum of consecutive naturals, for example, 28623 + ... + 28646.

It is an arithmetic number, because the mean of its divisors is an integer number (133630).

2⁶⁸⁷²²⁸ is an apocalyptic number.

It is an amenable number.

687228 is an abundant number, since it is smaller than the sum of its proper divisors (916332).

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

687228 is a wasteful number, since it uses less digits than its factorization.

687228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57276 (or 57274 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 687228 is about 828.9921591909. The cubic root of 687228 is about 88.2470673963.

The spelling of 687228 in words is "six hundred eighty-seven thousand, two hundred twenty-eight".