687417 has 4 divisors (see below), whose sum is σ = 916560. Its totient is φ = 458276.

The previous prime is 687413. The next prime is 687431. The reversal of 687417 is 714786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687417 - 2² = 687413 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687417.

It is not an unprimeable number, because it can be changed into a prime (687413) 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, 114567 + ... + 114572.

It is an arithmetic number, because the mean of its divisors is an integer number (229140).

2⁶⁸⁷⁴¹⁷ is an apocalyptic number.

It is an amenable number.

687417 is a deficient number, since it is larger than the sum of its proper divisors (229143).

687417 is a wasteful number, since it uses less digits than its factorization.

687417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229142.

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

The square root of 687417 is about 829.1061451949. The cubic root of 687417 is about 88.2551564958.

The spelling of 687417 in words is "six hundred eighty-seven thousand, four hundred seventeen".