freeCodeCamp/curriculum/challenges/english/10-coding-interview-prep/project-euler/problem-432-totient-sum.english.md

---
id: 5900f51e1000cf542c510030
challengeType: 5
title: 'Problem 432: Totient sum'
forumTopicId: 302103
---

## Description
<section id='description'>
Let S(n,m) = ∑φ(n × i) for 1 ≤ i ≤ m. (φ is Euler's totient function)
You are given that S(510510,106 )= 45480596821125120.


Find S(510510,1011).
Give the last 9 digits of your answer.
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
tests:
  - text: <code>euler432()</code> should return 754862080.
    testString: assert.strictEqual(euler432(), 754862080);

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function euler432() {
  // Good luck!
  return true;
}

euler432();
```

</div>



</section>

## Solution
<section id='solution'>

```js
// solution required
```

</section>