687388 has 12 divisors (see below), whose sum is σ = 1295560. Its totient is φ = 317232.

The previous prime is 687383. The next prime is 687389. The reversal of 687388 is 883786.

It is a self number, because there is not a number n which added to its sum of digits gives 687388.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687383) 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, 6558 + ... + 6661.

2⁶⁸⁷³⁸⁸ is an apocalyptic number.

It is an amenable number.

687388 is a deficient number, since it is larger than the sum of its proper divisors (608172).

687388 is a wasteful number, since it uses less digits than its factorization.

687388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13236 (or 13234 counting only the distinct ones).

The product of its digits is 64512, while the sum is 40.

The square root of 687388 is about 829.0886562968. The cubic root of 687388 is about 88.2539154076.

The spelling of 687388 in words is "six hundred eighty-seven thousand, three hundred eighty-eight".