1604507885 has 4 divisors (see below), whose sum is σ = 1925409468. Its totient is φ = 1283606304.

The previous prime is 1604507881. The next prime is 1604507939. The reversal of 1604507885 is 5887054061.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5887054061 = 7 ⋅841007723.

It can be written as a sum of positive squares in 2 ways, for example, as 1163423881 + 441084004 = 34109^2 + 21002^2 .

It is a cyclic number.

It is not a de Polignac number, because 1604507885 - 2² = 1604507881 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604507881) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 160450784 + ... + 160450793.

It is an arithmetic number, because the mean of its divisors is an integer number (481352367).

Almost surely, 2^1604507885 is an apocalyptic number.

It is an amenable number.

1604507885 is a deficient number, since it is larger than the sum of its proper divisors (320901583).

1604507885 is an equidigital number, since it uses as much as digits as its factorization.

1604507885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320901582.

The product of its (nonzero) digits is 268800, while the sum is 44.

The square root of 1604507885 is about 40056.3089288067. The cubic root of 1604507885 is about 1170.7044932913.

The spelling of 1604507885 in words is "one billion, six hundred four million, five hundred seven thousand, eight hundred eighty-five".