1604168664 has 96 divisors (see below), whose sum is σ = 4773827520. Its totient is φ = 447660864.

The previous prime is 1604168627. The next prime is 1604168681. The reversal of 1604168664 is 4668614061.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34707 + ... + 66429.

It is an arithmetic number, because the mean of its divisors is an integer number (49727370).

Almost surely, 2^1604168664 is an apocalyptic number.

1604168664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1604168664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2386913760).

1604168664 is an abundant number, since it is smaller than the sum of its proper divisors (3169658856).

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

1604168664 is a wasteful number, since it uses less digits than its factorization.

1604168664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31789 (or 31778 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 1604168664 is about 40052.0744032066. The cubic root of 1604168664 is about 1170.6219850152.

The spelling of 1604168664 in words is "one billion, six hundred four million, one hundred sixty-eight thousand, six hundred sixty-four".