805140625 has 21 divisors (see below), whose sum is σ = 1010865967. Its totient is φ = 641275000.

The previous prime is 805140569. The next prime is 805140641. The reversal of 805140625 is 526041508.

The square root of 805140625 is 28375.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 3 ways, for example, as 705380481 + 99760144 = 26559^2 + 9988^2 .

It is not a de Polignac number, because 805140625 - 2¹¹ = 805138577 is a prime.

It is a Duffinian number.

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 20 ways as a sum of consecutive naturals, for example, 3546762 + ... + 3546988.

Almost surely, 2^805140625 is an apocalyptic number.

805140625 is the 28375-th square number.

805140625 is the 14188-th centered octagonal number.

It is an amenable number.

805140625 is a deficient number, since it is larger than the sum of its proper divisors (205725342).

805140625 is an frugal number, since it uses more digits than its factorization.

805140625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The cubic root of 805140625 is about 930.3019118441.

The spelling of 805140625 in words is "eight hundred five million, one hundred forty thousand, six hundred twenty-five".