288721465 has 4 divisors (see below), whose sum is σ = 346465764. Its totient is φ = 230977168.

The previous prime is 288721453. The next prime is 288721481. The reversal of 288721465 is 564127882.

It is a happy number.

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 180956304 + 107765161 = 13452^2 + 10381^2 .

It is a cyclic number.

It is not a de Polignac number, because 288721465 - 2¹⁹ = 288197177 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28872142 + ... + 28872151.

It is an arithmetic number, because the mean of its divisors is an integer number (86616441).

Almost surely, 2^288721465 is an apocalyptic number.

It is an amenable number.

288721465 is a deficient number, since it is larger than the sum of its proper divisors (57744299).

288721465 is an equidigital number, since it uses as much as digits as its factorization.

288721465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57744298.

The product of its digits is 215040, while the sum is 43.

The square root of 288721465 is about 16991.8058192765. The cubic root of 288721465 is about 660.9364309085.

The spelling of 288721465 in words is "two hundred eighty-eight million, seven hundred twenty-one thousand, four hundred sixty-five".