611856 has 60 divisors (see below), whose sum is σ = 1960192. Its totient is φ = 174528.

The previous prime is 611839. The next prime is 611873. The reversal of 611856 is 658116.

It is an interprime number because it is at equal distance from previous prime (611839) and next prime (611873).

It is a congruent number.

It is an unprimeable number.

611856 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 11 ways as a sum of consecutive naturals, for example, 705 + ... + 1311.

2⁶¹¹⁸⁵⁶ 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 611856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (980096).

611856 is an abundant number, since it is smaller than the sum of its proper divisors (1348336).

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

611856 is a wasteful number, since it uses less digits than its factorization.

611856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 619 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 611856 is about 782.2122474111. The cubic root of 611856 is about 84.8951879970.

The spelling of 611856 in words is "six hundred eleven thousand, eight hundred fifty-six".