287866361 has 4 divisors (see below), whose sum is σ = 289798500. Its totient is φ = 285934224.

The previous prime is 287866349. The next prime is 287866363. The reversal of 287866361 is 163668782.

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 14592400 + 273273961 = 3820^2 + 16531^2 .

It is a cyclic number.

It is not a de Polignac number, because 287866361 - 2¹⁰ = 287865337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287866363) 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, 965846 + ... + 966143.

It is an arithmetic number, because the mean of its divisors is an integer number (72449625).

Almost surely, 2^287866361 is an apocalyptic number.

It is an amenable number.

287866361 is a deficient number, since it is larger than the sum of its proper divisors (1932139).

287866361 is a wasteful number, since it uses less digits than its factorization.

287866361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932138.

The product of its digits is 580608, while the sum is 47.

The square root of 287866361 is about 16966.6249148144. The cubic root of 287866361 is about 660.2832890090.

The spelling of 287866361 in words is "two hundred eighty-seven million, eight hundred sixty-six thousand, three hundred sixty-one".