1604531808 has 192 divisors, whose sum is σ = 5406186240. Its totient is φ = 457574400.

The previous prime is 1604531801. The next prime is 1604531809. The reversal of 1604531808 is 8081354061.

1604531808 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604531801) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 156603 + ... + 166533.

It is an arithmetic number, because the mean of its divisors is an integer number (28157220).

Almost surely, 2^1604531808 is an apocalyptic number.

1604531808 is a gapful number since it is divisible by the number (18) 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 1604531808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2703093120).

1604531808 is an abundant number, since it is smaller than the sum of its proper divisors (3801654432).

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

1604531808 is a wasteful number, since it uses less digits than its factorization.

1604531808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9978 (or 9964 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1604531808 is about 40056.6075448234. The cubic root of 1604531808 is about 1170.7103116120.

Adding to 1604531808 its reverse (8081354061), we get a palindrome (9685885869).

It can be divided in two parts, 160453 and 1808, that added together give a palindrome (162261).

The spelling of 1604531808 in words is "one billion, six hundred four million, five hundred thirty-one thousand, eight hundred eight".