609856 has 28 divisors (see below), whose sum is σ = 1305052. Its totient is φ = 281088.

The previous prime is 609821. The next prime is 609859. The reversal of 609856 is 658906.

It can be written as a sum of positive squares in 2 ways, for example, as 379456 + 230400 = 616^2 + 480^2 .

It is not an unprimeable number, because it can be changed into a prime (609859) by changing a digit.

609856 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 466 + ... + 1198.

It is an arithmetic number, because the mean of its divisors is an integer number (46609).

2⁶⁰⁹⁸⁵⁶ 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 609856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (652526).

609856 is an abundant number, since it is smaller than the sum of its proper divisors (695196).

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

609856 is a wasteful number, since it uses less digits than its factorization.

609856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758 (or 748 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 609856 is about 780.9327755960. The cubic root of 609856 is about 84.8025868441.

The spelling of 609856 in words is "six hundred nine thousand, eight hundred fifty-six".