687543 has 4 divisors (see below), whose sum is σ = 916728. Its totient is φ = 458360.

The previous prime is 687541. The next prime is 687551. The reversal of 687543 is 345786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687543 - 2¹ = 687541 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687541) 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, 114588 + ... + 114593.

It is an arithmetic number, because the mean of its divisors is an integer number (229182).

2⁶⁸⁷⁵⁴³ is an apocalyptic number.

687543 is a deficient number, since it is larger than the sum of its proper divisors (229185).

687543 is a wasteful number, since it uses less digits than its factorization.

687543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229184.

The product of its digits is 20160, while the sum is 33.

The square root of 687543 is about 829.1821271590. The cubic root of 687543 is about 88.2605484051.

The spelling of 687543 in words is "six hundred eighty-seven thousand, five hundred forty-three".