1604408004 has 36 divisors (see below), whose sum is σ = 4124331120. Its totient is φ = 525737520.

The previous prime is 1604407999. The next prime is 1604408009. The reversal of 1604408004 is 4008044061.

It is an interprime number because it is at equal distance from previous prime (1604407999) and next prime (1604408009).

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1604408009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375562 + ... + 379809.

Almost surely, 2^1604408004 is an apocalyptic number.

It is an amenable number.

1604408004 is an abundant number, since it is smaller than the sum of its proper divisors (2519923116).

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

1604408004 is a wasteful number, since it uses less digits than its factorization.

1604408004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755440 (or 755435 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 1604408004 is about 40055.0621519927. The cubic root of 1604408004 is about 1170.6802005756.

The spelling of 1604408004 in words is "one billion, six hundred four million, four hundred eight thousand, four".