289656 has 48 divisors (see below), whose sum is σ = 819000. Its totient is φ = 95904.

The previous prime is 289643. The next prime is 289657. The reversal of 289656 is 656982.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a d-powerful number, because it can be written as 2¹⁸ + 8⁴ + 6 + 9 + 5⁶ + 6⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 289656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (289657) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1870 + ... + 2018.

2²⁸⁹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 289656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (409500).

289656 is an abundant number, since it is smaller than the sum of its proper divisors (529344).

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

289656 is a wasteful number, since it uses less digits than its factorization.

289656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 154 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 289656 is about 538.1969899581. The cubic root of 289656 is about 66.1648770278.

The spelling of 289656 in words is "two hundred eighty-nine thousand, six hundred fifty-six".