285089787845 has 4 divisors (see below), whose sum is σ = 342107745420. Its totient is φ = 228071830272.

The previous prime is 285089787817. The next prime is 285089787893. The reversal of 285089787845 is 548787980582.

It is a Cunningham number, because it is equal to 533938²+1.

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 102631811044 + 182457976801 = 320362^2 + 427151^2 .

It is a cyclic number.

It is not a de Polignac number, because 285089787845 - 2²⁰ = 285088739269 is a prime.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 28508978780 + ... + 28508978789.

It is an arithmetic number, because the mean of its divisors is an integer number (85526936355).

Almost surely, 2^285089787845 is an apocalyptic number.

It is an amenable number.

285089787845 is a deficient number, since it is larger than the sum of its proper divisors (57017957575).

285089787845 is an equidigital number, since it uses as much as digits as its factorization.

285089787845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57017957574.

The product of its (nonzero) digits is 361267200, while the sum is 71.

The spelling of 285089787845 in words is "two hundred eighty-five billion, eighty-nine million, seven hundred eighty-seven thousand, eight hundred forty-five".