1605213604 has 48 divisors (see below), whose sum is σ = 2973712896. Its totient is φ = 757152000.

The previous prime is 1605213529. The next prime is 1605213611. The reversal of 1605213604 is 4063125061.

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, 838152 + ... + 840064.

It is an arithmetic number, because the mean of its divisors is an integer number (61952352).

Almost surely, 2^1605213604 is an apocalyptic number.

It is an amenable number.

1605213604 is a deficient number, since it is larger than the sum of its proper divisors (1368499292).

1605213604 is a wasteful number, since it uses less digits than its factorization.

1605213604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2116 (or 2114 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 1605213604 is about 40065.1170471272. The cubic root of 1605213604 is about 1170.8761071368.

Adding to 1605213604 its reverse (4063125061), we get a palindrome (5668338665).

The spelling of 1605213604 in words is "one billion, six hundred five million, two hundred thirteen thousand, six hundred four".