1604243220 has 48 divisors (see below), whose sum is σ = 4576642560. Its totient is φ = 419725696.

The previous prime is 1604243197. The next prime is 1604243239. The reversal of 1604243220 is 223424061.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249060 + ... + 255419.

It is an arithmetic number, because the mean of its divisors is an integer number (95346720).

Almost surely, 2^1604243220 is an apocalyptic number.

1604243220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604243220 is an abundant number, since it is smaller than the sum of its proper divisors (2972399340).

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

1604243220 is a wasteful number, since it uses less digits than its factorization.

1604243220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504544 (or 504542 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 1604243220 is about 40053.0051307015. The cubic root of 1604243220 is about 1170.6401201699.

Adding to 1604243220 its reverse (223424061), we get a palindrome (1827667281).

The spelling of 1604243220 in words is "one billion, six hundred four million, two hundred forty-three thousand, two hundred twenty".