687351 has 16 divisors (see below), whose sum is σ = 1064448. Its totient is φ = 386400.

The previous prime is 687343. The next prime is 687359. The reversal of 687351 is 153786.

It is an interprime number because it is at equal distance from previous prime (687343) and next prime (687359).

It is not a de Polignac number, because 687351 - 2³ = 687343 is a prime.

687351 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1261 + ... + 1721.

It is an arithmetic number, because the mean of its divisors is an integer number (66528).

2⁶⁸⁷³⁵¹ is an apocalyptic number.

687351 is a deficient number, since it is larger than the sum of its proper divisors (377097).

687351 is a wasteful number, since it uses less digits than its factorization.

687351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542.

The product of its digits is 5040, while the sum is 30.

The square root of 687351 is about 829.0663423394. The cubic root of 687351 is about 88.2523318994.

The spelling of 687351 in words is "six hundred eighty-seven thousand, three hundred fifty-one".