687471 has 4 divisors (see below), whose sum is σ = 916632. Its totient is φ = 458312.

The previous prime is 687461. The next prime is 687473. The reversal of 687471 is 174786.

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 687471 - 2⁷ = 687343 is a prime.

It is a super-3 number, since 3×687471³ = 974730157547364333, which contains 333 as substring.

It is a D-number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687471.

It is not an unprimeable number, because it can be changed into a prime (687473) 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, 114576 + ... + 114581.

It is an arithmetic number, because the mean of its divisors is an integer number (229158).

2⁶⁸⁷⁴⁷¹ is an apocalyptic number.

687471 is a deficient number, since it is larger than the sum of its proper divisors (229161).

687471 is a wasteful number, since it uses less digits than its factorization.

687471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229160.

The product of its digits is 9408, while the sum is 33.

The square root of 687471 is about 829.1387097464. The cubic root of 687471 is about 88.2574673948.

The spelling of 687471 in words is "six hundred eighty-seven thousand, four hundred seventy-one".