28081470221 has 24 divisors (see below), whose sum is σ = 33770721600. Its totient is φ = 23267526912.

The previous prime is 28081470217. The next prime is 28081470227. The reversal of 28081470221 is 12207418082.

It is not a de Polignac number, because 28081470221 - 2² = 28081470217 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081470227) 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 23 ways as a sum of consecutive naturals, for example, 135680 + ... + 273078.

It is an arithmetic number, because the mean of its divisors is an integer number (1407113400).

Almost surely, 2^28081470221 is an apocalyptic number.

It is an amenable number.

28081470221 is a deficient number, since it is larger than the sum of its proper divisors (5689251379).

28081470221 is a wasteful number, since it uses less digits than its factorization.

28081470221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137553 (or 137546 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 35.

The spelling of 28081470221 in words is "twenty-eight billion, eighty-one million, four hundred seventy thousand, two hundred twenty-one".