686672 has 20 divisors (see below), whose sum is σ = 1520736. Its totient is φ = 294240.

The previous prime is 686671. The next prime is 686687. The reversal of 686672 is 276686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2954 + ... + 3177.

2⁶⁸⁶⁶⁷² is an apocalyptic number.

It is an amenable number.

686672 is an abundant number, since it is smaller than the sum of its proper divisors (834064).

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

686672 is a wasteful number, since it uses less digits than its factorization.

686672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6146 (or 6140 counting only the distinct ones).

The product of its digits is 24192, while the sum is 35.

The square root of 686672 is about 828.6567443761. The cubic root of 686672 is about 88.2232622897.

The spelling of 686672 in words is "six hundred eighty-six thousand, six hundred seventy-two".