288085321 has 4 divisors (see below), whose sum is σ = 288552852. Its totient is φ = 287617792.

The previous prime is 288085313. The next prime is 288085339. The reversal of 288085321 is 123580882.

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 5475600 + 282609721 = 2340^2 + 16811^2 .

It is a cyclic number.

It is not a de Polignac number, because 288085321 - 2³ = 288085313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (288085361) 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, 232840 + ... + 234073.

It is an arithmetic number, because the mean of its divisors is an integer number (72138213).

Almost surely, 2^288085321 is an apocalyptic number.

It is an amenable number.

288085321 is a deficient number, since it is larger than the sum of its proper divisors (467531).

288085321 is an equidigital number, since it uses as much as digits as its factorization.

288085321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467530.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 288085321 is about 16973.0763563946. The cubic root of 288085321 is about 660.4506571675.

The spelling of 288085321 in words is "two hundred eighty-eight million, eighty-five thousand, three hundred twenty-one".