687406 has 16 divisors (see below), whose sum is σ = 1079568. Its totient is φ = 328000.

The previous prime is 687403. The next prime is 687413. The reversal of 687406 is 604786.

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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6756 + ... + 6856.

It is an arithmetic number, because the mean of its divisors is an integer number (67473).

2⁶⁸⁷⁴⁰⁶ is an apocalyptic number.

687406 is a deficient number, since it is larger than the sum of its proper divisors (392162).

687406 is a wasteful number, since it uses less digits than its factorization.

687406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 687406 is about 829.0995115184. The cubic root of 687406 is about 88.2546857423.

The spelling of 687406 in words is "six hundred eighty-seven thousand, four hundred six".