28056022331 has 4 divisors (see below), whose sum is σ = 28059762192. Its totient is φ = 28052282472.

The previous prime is 28056022273. The next prime is 28056022339. The reversal of 28056022331 is 13322065082.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28056022331 is a prime.

It is a super-2 number, since 2×28056022331² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056022339) 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, 1858655 + ... + 1873688.

It is an arithmetic number, because the mean of its divisors is an integer number (7014940548).

Almost surely, 2^28056022331 is an apocalyptic number.

28056022331 is a deficient number, since it is larger than the sum of its proper divisors (3739861).

28056022331 is an equidigital number, since it uses as much as digits as its factorization.

28056022331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739860.

The product of its (nonzero) digits is 17280, while the sum is 32.

The spelling of 28056022331 in words is "twenty-eight billion, fifty-six million, twenty-two thousand, three hundred thirty-one".