687284 has 12 divisors (see below), whose sum is σ = 1295364. Its totient is φ = 317184.

The previous prime is 687277. The next prime is 687289. The reversal of 687284 is 482786.

It can be written as a sum of positive squares in 2 ways, for example, as 183184 + 504100 = 428^2 + 710^2 .

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6557 + ... + 6660.

It is an arithmetic number, because the mean of its divisors is an integer number (107947).

2⁶⁸⁷²⁸⁴ is an apocalyptic number.

It is an amenable number.

687284 is a deficient number, since it is larger than the sum of its proper divisors (608080).

687284 is a wasteful number, since it uses less digits than its factorization.

687284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13234 (or 13232 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 687284 is about 829.0259344556. The cubic root of 687284 is about 88.2494643212.

The spelling of 687284 in words is "six hundred eighty-seven thousand, two hundred eighty-four".