687741 has 4 divisors (see below), whose sum is σ = 916992. Its totient is φ = 458492.

The previous prime is 687737. The next prime is 687749. The reversal of 687741 is 147786.

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 687741 - 2² = 687737 is a prime.

It is a D-number.

687741 is a lucky 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 687741.

It is not an unprimeable number, because it can be changed into a prime (687749) 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, 114621 + ... + 114626.

It is an arithmetic number, because the mean of its divisors is an integer number (229248).

2⁶⁸⁷⁷⁴¹ is an apocalyptic number.

It is an amenable number.

687741 is a deficient number, since it is larger than the sum of its proper divisors (229251).

687741 is a wasteful number, since it uses less digits than its factorization.

687741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229250.

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

The square root of 687741 is about 829.3015133231. The cubic root of 687741 is about 88.2690200747.

The spelling of 687741 in words is "six hundred eighty-seven thousand, seven hundred forty-one".