1604665716 has 24 divisors (see below), whose sum is σ = 3807683040. Its totient is φ = 525822432.

The previous prime is 1604665697. The next prime is 1604665721. The reversal of 1604665716 is 6175664061.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1132531 + ... + 1133946.

It is an arithmetic number, because the mean of its divisors is an integer number (158653460).

Almost surely, 2^1604665716 is an apocalyptic number.

It is an amenable number.

1604665716 is an abundant number, since it is smaller than the sum of its proper divisors (2203017324).

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

1604665716 is a wasteful number, since it uses less digits than its factorization.

1604665716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266543 (or 2266541 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 1604665716 is about 40058.2789944850. The cubic root of 1604665716 is about 1170.7428783531.

The spelling of 1604665716 in words is "one billion, six hundred four million, six hundred sixty-five thousand, seven hundred sixteen".