1604028 has 12 divisors (see below), whose sum is σ = 3742760. Its totient is φ = 534672.

The previous prime is 1604021. The next prime is 1604051. The reversal of 1604028 is 8204061.

It is a tau number, because it is divible by the number of its divisors (12).

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 1603995 and 1604013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66823 + ... + 66846.

2^1604028 is an apocalyptic number.

It is an amenable number.

1604028 is an abundant number, since it is smaller than the sum of its proper divisors (2138732).

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

1604028 is a wasteful number, since it uses less digits than its factorization.

1604028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133676 (or 133674 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 1604028 is about 1266.5022700335. The cubic root of 1604028 is about 117.0587768084.

Adding to 1604028 its reverse (8204061), we get a palindrome (9808089).

The spelling of 1604028 in words is "one million, six hundred four thousand, twenty-eight".