687407 has 8 divisors (see below), whose sum is σ = 790656. Its totient is φ = 585432.

The previous prime is 687403. The next prime is 687413. The reversal of 687407 is 704786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687407 - 2² = 687403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1808 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (98832).

2⁶⁸⁷⁴⁰⁷ is an apocalyptic number.

687407 is a deficient number, since it is larger than the sum of its proper divisors (103249).

687407 is a wasteful number, since it uses less digits than its factorization.

687407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 687407 is about 829.1001145821. The cubic root of 687407 is about 88.2547285383.

The spelling of 687407 in words is "six hundred eighty-seven thousand, four hundred seven".