1604506644 has 144 divisors (see below), whose sum is σ = 4636503872. Its totient is φ = 482049792.

The previous prime is 1604506643. The next prime is 1604506679. The reversal of 1604506644 is 4466054061.

1604506644 is a `hidden beast` number, since 1 + 6 + 0 + 4 + 5 + 0 + 6 + 644 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1604506599 and 1604506608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604506643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 541872 + ... + 544824.

Almost surely, 2^1604506644 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 1604506644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2318251936).

1604506644 is an abundant number, since it is smaller than the sum of its proper divisors (3031997228).

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

1604506644 is a wasteful number, since it uses less digits than its factorization.

1604506644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3028 (or 3014 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 1604506644 is about 40056.2934381103. The cubic root of 1604506644 is about 1170.7041914657.

The spelling of 1604506644 in words is "one billion, six hundred four million, five hundred six thousand, six hundred forty-four".