285663145 has 4 divisors (see below), whose sum is σ = 342795780. Its totient is φ = 228530512.

The previous prime is 285663139. The next prime is 285663149. The reversal of 285663145 is 541366582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127306089 + 158357056 = 11283^2 + 12584^2 .

It is a cyclic number.

It is not a de Polignac number, because 285663145 - 2¹¹ = 285661097 is a prime.

It is a super-2 number, since 2×285663145² = 163206864822582050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 285663098 and 285663107.

It is not an unprimeable number, because it can be changed into a prime (285663149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28566310 + ... + 28566319.

It is an arithmetic number, because the mean of its divisors is an integer number (85698945).

Almost surely, 2^285663145 is an apocalyptic number.

It is an amenable number.

285663145 is a deficient number, since it is larger than the sum of its proper divisors (57132635).

285663145 is an equidigital number, since it uses as much as digits as its factorization.

285663145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57132634.

The product of its digits is 172800, while the sum is 40.

The square root of 285663145 is about 16901.5722641416. The cubic root of 285663145 is about 658.5944568293.

The spelling of 285663145 in words is "two hundred eighty-five million, six hundred sixty-three thousand, one hundred forty-five".