1604764 has 24 divisors (see below), whose sum is σ = 3298400. Its totient is φ = 668736.

The previous prime is 1604753. The next prime is 1604809. The reversal of 1604764 is 4674061.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262 + ... + 1810.

2^1604764 is an apocalyptic number.

1604764 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 1604764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1649200).

1604764 is an abundant number, since it is smaller than the sum of its proper divisors (1693636).

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

1604764 is a wasteful number, since it uses less digits than its factorization.

1604764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597 (or 1595 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 1604764 is about 1266.7928007374. The cubic root of 1604764 is about 117.0766780100.

Subtracting from 1604764 its sum of digits (28), we obtain a triangular number (1604736 = T₁₇₉₁).

The spelling of 1604764 in words is "one million, six hundred four thousand, seven hundred sixty-four".