687682 has 8 divisors (see below), whose sum is σ = 1059516. Its totient is φ = 334512.

The previous prime is 687679. The next prime is 687683. The reversal of 687682 is 286786.

687682 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 687241 + 441 = 829^2 + 21^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (687683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4573 + ... + 4720.

2⁶⁸⁷⁶⁸² is an apocalyptic number.

687682 is a deficient number, since it is larger than the sum of its proper divisors (371834).

687682 is a wasteful number, since it uses less digits than its factorization.

687682 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9332.

The product of its digits is 32256, while the sum is 37.

The square root of 687682 is about 829.2659404558. The cubic root of 687682 is about 88.2664958584.

It can be divided in two parts, 687 and 682, that added together give a square (1369 = 37²).

The spelling of 687682 in words is "six hundred eighty-seven thousand, six hundred eighty-two".