28206244721 has 8 divisors (see below), whose sum is σ = 28396159680. Its totient is φ = 28016638992.

The previous prime is 28206244711. The next prime is 28206244733. The reversal of 28206244721 is 12744260282.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28206244721 - 2⁶ = 28206244657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28206244711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 107210 + ... + 260588.

It is an arithmetic number, because the mean of its divisors is an integer number (3549519960).

Almost surely, 2^28206244721 is an apocalyptic number.

It is an amenable number.

28206244721 is a deficient number, since it is larger than the sum of its proper divisors (189914959).

28206244721 is a wasteful number, since it uses less digits than its factorization.

28206244721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154615.

The product of its (nonzero) digits is 86016, while the sum is 38.

The spelling of 28206244721 in words is "twenty-eight billion, two hundred six million, two hundred forty-four thousand, seven hundred twenty-one".