28550235531 has 16 divisors (see below), whose sum is σ = 38344492800. Its totient is φ = 18894881760.

The previous prime is 28550235521. The next prime is 28550235533. The reversal of 28550235531 is 13553205582.

It is not a de Polignac number, because 28550235531 - 2¹⁷ = 28550104459 is a prime.

It is a super-2 number, since 2×28550235531² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28550235531.

It is not an unprimeable number, because it can be changed into a prime (28550235533) 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 15 ways as a sum of consecutive naturals, for example, 801016 + ... + 835898.

It is an arithmetic number, because the mean of its divisors is an integer number (2396530800).

Almost surely, 2^28550235531 is an apocalyptic number.

28550235531 is a deficient number, since it is larger than the sum of its proper divisors (9794257269).

28550235531 is a wasteful number, since it uses less digits than its factorization.

28550235531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36866.

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 28550235531 in words is "twenty-eight billion, five hundred fifty million, two hundred thirty-five thousand, five hundred thirty-one".