285728805 has 12 divisors (see below), whose sum is σ = 495263340. Its totient is φ = 152388672.

The previous prime is 285728771. The next prime is 285728827. The reversal of 285728805 is 508827582.

It can be written as a sum of positive squares in 2 ways, for example, as 148206276 + 137522529 = 12174^2 + 11727^2 .

It is not a de Polignac number, because 285728805 - 2¹⁸ = 285466661 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 6349529 = 285728805 / (2 + 8 + 5 + 7 + 2 + 8 + 8 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3174720 + ... + 3174809.

It is an arithmetic number, because the mean of its divisors is an integer number (41271945).

Almost surely, 2^285728805 is an apocalyptic number.

It is an amenable number.

285728805 is a deficient number, since it is larger than the sum of its proper divisors (209534535).

285728805 is a wasteful number, since it uses less digits than its factorization.

285728805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349540 (or 6349537 counting only the distinct ones).

The product of its (nonzero) digits is 358400, while the sum is 45.

The square root of 285728805 is about 16903.5145753775. The cubic root of 285728805 is about 658.6449125263.

The spelling of 285728805 in words is "two hundred eighty-five million, seven hundred twenty-eight thousand, eight hundred five".