611720 has 32 divisors (see below), whose sum is σ = 1413720. Its totient is φ = 238080.

The previous prime is 611707. The next prime is 611729. The reversal of 611720 is 27116.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 343396 + 268324 = 586^2 + 518^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611729) by changing a digit.

611720 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1454 + ... + 1826.

2⁶¹¹⁷²⁰ 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 611720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (706860).

611720 is an abundant number, since it is smaller than the sum of its proper divisors (802000).

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

611720 is a wasteful number, since it uses less digits than its factorization.

611720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 421 counting only the distinct ones).

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 611720 is about 782.1253096531. The cubic root of 611720 is about 84.8888975184. Note that the first 4 decimals are identical.

Adding to 611720 its reverse (27116), we get a palindrome (638836).

It can be divided in two parts, 611 and 720, that added together give a palindrome (1331).

The spelling of 611720 in words is "six hundred eleven thousand, seven hundred twenty".