611660 has 48 divisors (see below), whose sum is σ = 1560384. Its totient is φ = 196608.

The previous prime is 611657. The next prime is 611671. The reversal of 611660 is 66116.

611660 = 273² + 274² + ... + 280².

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2252 + ... + 2508.

It is an arithmetic number, because the mean of its divisors is an integer number (32508).

2⁶¹¹⁶⁶⁰ 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 611660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (780192).

611660 is an abundant number, since it is smaller than the sum of its proper divisors (948724).

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

611660 is a wasteful number, since it uses less digits than its factorization.

611660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 611660 is about 782.0869516876. The cubic root of 611660 is about 84.8861220109.

Adding to 611660 its reverse (66116), we get a palindrome (677776).

The spelling of 611660 in words is "six hundred eleven thousand, six hundred sixty".