287828406721 has 4 divisors (see below), whose sum is σ = 287835988932. Its totient is φ = 287820824512.

The previous prime is 287828406683. The next prime is 287828406737. The reversal of 287828406721 is 127604828782.

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 256015760400 + 31812646321 = 505980^2 + 178361^2 .

It is a cyclic number.

It is not a de Polignac number, because 287828406721 - 2³⁵ = 253468668353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (287828406781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3733876 + ... + 3810181.

It is an arithmetic number, because the mean of its divisors is an integer number (71958997233).

Almost surely, 2^287828406721 is an apocalyptic number.

It is an amenable number.

287828406721 is a deficient number, since it is larger than the sum of its proper divisors (7582211).

287828406721 is an equidigital number, since it uses as much as digits as its factorization.

287828406721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7582210.

The product of its (nonzero) digits is 4816896, while the sum is 55.

The spelling of 287828406721 in words is "two hundred eighty-seven billion, eight hundred twenty-eight million, four hundred six thousand, seven hundred twenty-one".