285144689 has 4 divisors (see below), whose sum is σ = 301917924. Its totient is φ = 268371456.

The previous prime is 285144679. The next prime is 285144707. The reversal of 285144689 is 986441582.

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 105370225 + 179774464 = 10265^2 + 13408^2 .

It is a cyclic number.

It is not a de Polignac number, because 285144689 - 2¹⁶ = 285079153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285144619) 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, 8386592 + ... + 8386625.

It is an arithmetic number, because the mean of its divisors is an integer number (75479481).

Almost surely, 2^285144689 is an apocalyptic number.

It is an amenable number.

285144689 is a deficient number, since it is larger than the sum of its proper divisors (16773235).

285144689 is a wasteful number, since it uses less digits than its factorization.

285144689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16773234.

The product of its digits is 552960, while the sum is 47.

The square root of 285144689 is about 16886.2277907175. The cubic root of 285144689 is about 658.1957832729.

The spelling of 285144689 in words is "two hundred eighty-five million, one hundred forty-four thousand, six hundred eighty-nine".