287867660089 has 3 divisors (see below), whose sum is σ = 287868196623. Its totient is φ = 287867123556.

The previous prime is 287867660077. The next prime is 287867660111. The reversal of 287867660089 is 980066768782.

The square root of 287867660089 is 536533.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 980066768782 = 2 ⋅490033384391.

It can be written as a sum of positive squares in only one way, i.e., 31924755625 + 255942904464 = 178675^2 + 505908^2 .

It is not a de Polignac number, because 287867660089 - 2¹¹ = 287867658041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287867660489) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 268267 + ... + 804799.

It is an arithmetic number, because the mean of its divisors is an integer number (95956065541).

Almost surely, 2^287867660089 is an apocalyptic number.

287867660089 is the 536533-rd square number.

287867660089 is the 268267-th centered octagonal number.

It is an amenable number.

287867660089 is a deficient number, since it is larger than the sum of its proper divisors (536534).

287867660089 is an frugal number, since it uses more digits than its factorization.

287867660089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073066 (or 536533 counting only the distinct ones).

The product of its (nonzero) digits is 97542144, while the sum is 67.

The spelling of 287867660089 in words is "two hundred eighty-seven billion, eight hundred sixty-seven million, six hundred sixty thousand, eighty-nine".