28256644627 has 4 divisors (see below), whose sum is σ = 28298631400. Its totient is φ = 28214657856.

The previous prime is 28256644597. The next prime is 28256644631. The reversal of 28256644627 is 72644665282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28256644627 - 2⁷ = 28256644499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28256654627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20992377 + ... + 20993722.

It is an arithmetic number, because the mean of its divisors is an integer number (7074657850).

Almost surely, 2^28256644627 is an apocalyptic number.

28256644627 is a deficient number, since it is larger than the sum of its proper divisors (41986773).

28256644627 is an equidigital number, since it uses as much as digits as its factorization.

28256644627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41986772.

The product of its digits is 7741440, while the sum is 52.

The spelling of 28256644627 in words is "twenty-eight billion, two hundred fifty-six million, six hundred forty-four thousand, six hundred twenty-seven".