687533 has 8 divisors (see below), whose sum is σ = 857280. Its totient is φ = 535680.

The previous prime is 687523. The next prime is 687541. The reversal of 687533 is 335786.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 687533 - 2⁴ = 687517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 687533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4388 + ... + 4541.

It is an arithmetic number, because the mean of its divisors is an integer number (107160).

2⁶⁸⁷⁵³³ is an apocalyptic number.

It is an amenable number.

687533 is a deficient number, since it is larger than the sum of its proper divisors (169747).

687533 is a wasteful number, since it uses less digits than its factorization.

687533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8947.

The product of its digits is 15120, while the sum is 32.

The square root of 687533 is about 829.1760970988. The cubic root of 687533 is about 88.2601204999.

The spelling of 687533 in words is "six hundred eighty-seven thousand, five hundred thirty-three".