611604 has 48 divisors (see below), whose sum is σ = 1814400. Its totient is φ = 174528.

The previous prime is 611603. The next prime is 611621. The reversal of 611604 is 406116.

611604 is a `hidden beast` number, since 61 + 1 + 604 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352 + ... + 1160.

It is an arithmetic number, because the mean of its divisors is an integer number (37800).

2⁶¹¹⁶⁰⁴ 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 611604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907200).

611604 is an abundant number, since it is smaller than the sum of its proper divisors (1202796).

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

611604 is a wasteful number, since it uses less digits than its factorization.

611604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 821 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 611604 is about 782.0511492224. The cubic root of 611604 is about 84.8835313735.

The spelling of 611604 in words is "six hundred eleven thousand, six hundred four".