1604544 has 56 divisors (see below), whose sum is σ = 4346448. Its totient is φ = 522240.

The previous prime is 1604543. The next prime is 1604557. The reversal of 1604544 is 4454061.

It is a super-2 number, since 2×1604544² = 5149122895872, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11644 + ... + 11780.

2^1604544 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 1604544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2173224).

1604544 is an abundant number, since it is smaller than the sum of its proper divisors (2741904).

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

1604544 is a wasteful number, since it uses less digits than its factorization.

1604544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 1604544 is about 1266.7059643027. The cubic root of 1604544 is about 117.0713276810.

The spelling of 1604544 in words is "one million, six hundred four thousand, five hundred forty-four".