1604402004 has 12 divisors (see below), whose sum is σ = 3743604704. Its totient is φ = 534800664.

The previous prime is 1604401999. The next prime is 1604402017. The reversal of 1604402004 is 4002044061.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66850072 + ... + 66850095.

Almost surely, 2^1604402004 is an apocalyptic number.

It is an amenable number.

1604402004 is an abundant number, since it is smaller than the sum of its proper divisors (2139202700).

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

1604402004 is a wasteful number, since it uses less digits than its factorization.

1604402004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133700174 (or 133700172 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1604402004 is about 40054.9872550223. The cubic root of 1604402004 is about 1170.6787412440.

Adding to 1604402004 its reverse (4002044061), we get a palindrome (5606446065).

The spelling of 1604402004 in words is "one billion, six hundred four million, four hundred two thousand, four".