686722 has 8 divisors (see below), whose sum is σ = 1034316. Its totient is φ = 341952.

The previous prime is 686687. The next prime is 686723. The reversal of 686722 is 227686.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 549081 + 137641 = 741^2 + 371^2 .

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

It is not an unprimeable number, because it can be changed into a prime (686723) 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, 78 + ... + 1174.

2⁶⁸⁶⁷²² is an apocalyptic number.

686722 is a deficient number, since it is larger than the sum of its proper divisors (347594).

686722 is a wasteful number, since it uses less digits than its factorization.

686722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1412.

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

The square root of 686722 is about 828.6869131343. The cubic root of 686722 is about 88.2254035624.

It can be divided in two parts, 6867 and 22, that added together give a square (6889 = 83²).

The spelling of 686722 in words is "six hundred eighty-six thousand, seven hundred twenty-two".