687426 has 8 divisors (see below), whose sum is σ = 1374864. Its totient is φ = 229140.

The previous prime is 687413. The next prime is 687431. The reversal of 687426 is 624786.

687426 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

687426 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57280 + ... + 57291.

It is an arithmetic number, because the mean of its divisors is an integer number (171858).

2⁶⁸⁷⁴²⁶ is an apocalyptic number.

687426 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687426 is a wasteful number, since it uses less digits than its factorization.

687426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114576.

The product of its digits is 16128, while the sum is 33.

The square root of 687426 is about 829.1115727090. Note that the first 3 decimals coincide. The cubic root of 687426 is about 88.2555416541.

The spelling of 687426 in words is "six hundred eighty-seven thousand, four hundred twenty-six".