687071 has 8 divisors (see below), whose sum is σ = 856704. Its totient is φ = 535320.

The previous prime is 687061. The next prime is 687073. The reversal of 687071 is 170786.

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 687071 - 2⁶ = 687007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4385 + ... + 4538.

It is an arithmetic number, because the mean of its divisors is an integer number (107088).

2⁶⁸⁷⁰⁷¹ is an apocalyptic number.

687071 is a deficient number, since it is larger than the sum of its proper divisors (169633).

687071 is a wasteful number, since it uses less digits than its factorization.

687071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8941.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 687071 is about 828.8974604859. The cubic root of 687071 is about 88.2403467521.

The spelling of 687071 in words is "six hundred eighty-seven thousand, seventy-one".