688071 has 8 divisors (see below), whose sum is σ = 922624. Its totient is φ = 456120.

The previous prime is 688067. The next prime is 688073. The reversal of 688071 is 170886.

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

It is not a de Polignac number, because 688071 - 2² = 688067 is a prime.

It is the 830-th Hogben number.

It is a Duffinian number.

688071 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688073) by changing a digit.

It is a nontrivial repunit in base 829.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90 + ... + 1176.

It is an arithmetic number, because the mean of its divisors is an integer number (115328).

2⁶⁸⁸⁰⁷¹ is an apocalyptic number.

688071 is a deficient number, since it is larger than the sum of its proper divisors (234553).

688071 is a wasteful number, since it uses less digits than its factorization.

688071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301.

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 688071 is about 829.5004520794. The cubic root of 688071 is about 88.2831359114.

The spelling of 688071 in words is "six hundred eighty-eight thousand, seventy-one".