1604215404 has 144 divisors (see below), whose sum is σ = 4835690496. Its totient is φ = 442713600.

The previous prime is 1604215397. The next prime is 1604215409. The reversal of 1604215404 is 4045124061.

1604215404 is a `hidden beast` number, since 1 + 604 + 2 + 1 + 54 + 0 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (1604215409) 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, 204849 + ... + 212535.

It is an arithmetic number, because the mean of its divisors is an integer number (33581184).

Almost surely, 2^1604215404 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 1604215404, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2417845248).

1604215404 is an abundant number, since it is smaller than the sum of its proper divisors (3231475092).

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

1604215404 is a wasteful number, since it uses less digits than its factorization.

1604215404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7756 (or 7751 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 1604215404 is about 40052.6578893336. The cubic root of 1604215404 is about 1170.6333542146.

Adding to 1604215404 its reverse (4045124061), we get a palindrome (5649339465).

The spelling of 1604215404 in words is "one billion, six hundred four million, two hundred fifteen thousand, four hundred four".