659920 has 40 divisors (see below), whose sum is σ = 1569096. Its totient is φ = 258048.

The previous prime is 659917. The next prime is 659941. The reversal of 659920 is 29956.

It can be written as a sum of positive squares in 4 ways, for example, as 576 + 659344 = 24^2 + 812^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 5784 + ... + 5896.

2⁶⁵⁹⁹²⁰ 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 659920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784548).

659920 is an abundant number, since it is smaller than the sum of its proper divisors (909176).

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

659920 is a wasteful number, since it uses less digits than its factorization.

659920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199 (or 193 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 659920 is about 812.3546023751. The cubic root of 659920 is about 87.0623589564.

The spelling of 659920 in words is "six hundred fifty-nine thousand, nine hundred twenty".