1605530880 has 108 divisors (see below), whose sum is σ = 5555009460. Its totient is φ = 428138496.

The previous prime is 1605530867. The next prime is 1605530917. The reversal of 1605530880 is 880355061.

It can be written as a sum of positive squares in 2 ways, for example, as 404492544 + 1201038336 = 20112^2 + 34656^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58165 + ... + 81204.

Almost surely, 2^1605530880 is an apocalyptic number.

1605530880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1605530880 is an abundant number, since it is smaller than the sum of its proper divisors (3949478580).

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

1605530880 is a wasteful number, since it uses less digits than its factorization.

1605530880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139396 (or 139379 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 1605530880 is about 40069.0763557135. The cubic root of 1605530880 is about 1170.9532446206.

The spelling of 1605530880 in words is "one billion, six hundred five million, five hundred thirty thousand, eight hundred eighty".