1604512220 has 24 divisors (see below), whose sum is σ = 3372507600. Its totient is φ = 641227392.

The previous prime is 1604512157. The next prime is 1604512237. The reversal of 1604512220 is 222154061.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 12950 + ... + 58109.

It is an arithmetic number, because the mean of its divisors is an integer number (140521150).

Almost surely, 2^1604512220 is an apocalyptic number.

1604512220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1604512220 is an abundant number, since it is smaller than the sum of its proper divisors (1767995380).

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

1604512220 is a wasteful number, since it uses less digits than its factorization.

1604512220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72197 (or 72195 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1604512220 is about 40056.3630400964. The cubic root of 1604512220 is about 1170.7055476124.

Adding to 1604512220 its reverse (222154061), we get a palindrome (1826666281).

The spelling of 1604512220 in words is "one billion, six hundred four million, five hundred twelve thousand, two hundred twenty".