1604261556 has 36 divisors (see below), whose sum is σ = 4195054500. Its totient is φ = 516313728.

The previous prime is 1604261537. The next prime is 1604261557. The reversal of 1604261556 is 6551624061.

1604261556 is a `hidden beast` number, since 1 + 6 + 0 + 42 + 61 + 556 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 260305956 + 1343955600 = 16134^2 + 36660^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×1604261556² = 5147310280119082272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1604261556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604261557) 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 11 ways as a sum of consecutive naturals, for example, 767281 + ... + 769368.

Almost surely, 2^1604261556 is an apocalyptic number.

It is an amenable number.

1604261556 is an abundant number, since it is smaller than the sum of its proper divisors (2590792944).

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

1604261556 is a wasteful number, since it uses less digits than its factorization.

1604261556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536688 (or 1536683 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 1604261556 is about 40053.2340267300. The cubic root of 1604261556 is about 1170.6445801702.

The spelling of 1604261556 in words is "one billion, six hundred four million, two hundred sixty-one thousand, five hundred fifty-six".