2805785728 has 32 divisors (see below), whose sum is σ = 5782405500. Its totient is φ = 1354515456.

The previous prime is 2805785659. The next prime is 2805785737. The reversal of 2805785728 is 8275875082.

It can be written as a sum of positive squares in 2 ways, for example, as 2803914304 + 1871424 = 52952^2 + 1368^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 374223 + ... + 381646.

Almost surely, 2^2805785728 is an apocalyptic number.

It is an amenable number.

2805785728 is an abundant number, since it is smaller than the sum of its proper divisors (2976619772).

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

2805785728 is an equidigital number, since it uses as much as digits as its factorization.

2805785728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755912 (or 755900 counting only the distinct ones).

The product of its (nonzero) digits is 2508800, while the sum is 52.

The square root of 2805785728 is about 52969.6679997147. The cubic root of 2805785728 is about 1410.4298821693.

The spelling of 2805785728 in words is "two billion, eight hundred five million, seven hundred eighty-five thousand, seven hundred twenty-eight".