1604291328 has 108 divisors (see below), whose sum is σ = 4652332048. Its totient is φ = 531671040.

The previous prime is 1604291263. The next prime is 1604291329. The reversal of 1604291328 is 8231924061.

1604291328 is a `hidden beast` number, since 1 + 604 + 29 + 1 + 3 + 28 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1604291292 and 1604291301.

It is not an unprimeable number, because it can be changed into a prime (1604291329) 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, 415101 + ... + 418947.

Almost surely, 2^1604291328 is an apocalyptic number.

1604291328 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 1604291328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2326166024).

1604291328 is an abundant number, since it is smaller than the sum of its proper divisors (3048040720).

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

1604291328 is a wasteful number, since it uses less digits than its factorization.

1604291328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4050 (or 4033 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 1604291328 is about 40053.6056803879. The cubic root of 1604291328 is about 1170.6518217605.

The spelling of 1604291328 in words is "one billion, six hundred four million, two hundred ninety-one thousand, three hundred twenty-eight".