282666721 has 4 divisors (see below), whose sum is σ = 282708244. Its totient is φ = 282625200.

The previous prime is 282666707. The next prime is 282666739. The reversal of 282666721 is 127666282.

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 97298496 + 185368225 = 9864^2 + 13615^2 .

It is a cyclic number.

It is not a de Polignac number, because 282666721 - 2⁵ = 282666689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (282666121) by changing a digit.

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, 7890 + ... + 25051.

It is an arithmetic number, because the mean of its divisors is an integer number (70677061).

Almost surely, 2^282666721 is an apocalyptic number.

It is an amenable number.

282666721 is a deficient number, since it is larger than the sum of its proper divisors (41523).

282666721 is an equidigital number, since it uses as much as digits as its factorization.

282666721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41522.

The product of its digits is 96768, while the sum is 40.

The square root of 282666721 is about 16812.6952330672. The cubic root of 282666721 is about 656.2836130206.

The spelling of 282666721 in words is "two hundred eighty-two million, six hundred sixty-six thousand, seven hundred twenty-one".