609660 has 48 divisors (see below), whose sum is σ = 1898400. Its totient is φ = 162432.

The previous prime is 609641. The next prime is 609673. The reversal of 609660 is 66906.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

609660 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 (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25 + ... + 1104.

It is an arithmetic number, because the mean of its divisors is an integer number (39550).

2⁶⁰⁹⁶⁶⁰ is an apocalyptic number.

609660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 609660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (949200).

609660 is an abundant number, since it is smaller than the sum of its proper divisors (1288740).

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

609660 is a wasteful number, since it uses less digits than its factorization.

609660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1147 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 609660 is about 780.8072745563. The cubic root of 609660 is about 84.7935010446.

The spelling of 609660 in words is "six hundred nine thousand, six hundred sixty".