28550365881 has 8 divisors (see below), whose sum is σ = 38091208320. Its totient is φ = 19021550352.

The previous prime is 28550365873. The next prime is 28550365931. The reversal of 28550365881 is 18856305582.

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

It is not a de Polignac number, because 28550365881 - 2³ = 28550365873 is a prime.

It is a super-2 number, since 2×28550365881² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (28550365801) 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 7 ways as a sum of consecutive naturals, for example, 3001186 + ... + 3010683.

It is an arithmetic number, because the mean of its divisors is an integer number (4761401040).

Almost surely, 2^28550365881 is an apocalyptic number.

It is an amenable number.

28550365881 is a deficient number, since it is larger than the sum of its proper divisors (9540842439).

28550365881 is a wasteful number, since it uses less digits than its factorization.

28550365881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6013455.

The product of its (nonzero) digits is 2304000, while the sum is 51.

The spelling of 28550365881 in words is "twenty-eight billion, five hundred fifty million, three hundred sixty-five thousand, eight hundred eighty-one".