689856 has 28 divisors (see below), whose sum is σ = 1825752. Its totient is φ = 229888.

The previous prime is 689851. The next prime is 689867. The reversal of 689856 is 658986.

It is not an unprimeable number, because it can be changed into a prime (689851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1605 + ... + 1988.

2⁶⁸⁹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

689856 is an abundant number, since it is smaller than the sum of its proper divisors (1135896).

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

689856 is a wasteful number, since it uses less digits than its factorization.

689856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608 (or 3598 counting only the distinct ones).

The product of its digits is 103680, while the sum is 42.

The square root of 689856 is about 830.5757039548. The cubic root of 689856 is about 88.3594116270.

The spelling of 689856 in words is "six hundred eighty-nine thousand, eight hundred fifty-six".