28357484881 has 16 divisors (see below), whose sum is σ = 31827319488. Its totient is φ = 25046841600.

The previous prime is 28357484879. The next prime is 28357484923. The reversal of 28357484881 is 18848475382.

It is a happy number.

It is not a de Polignac number, because 28357484881 - 2¹ = 28357484879 is a prime.

It is a super-2 number, since 2×28357484881² (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 (28357485881) 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, 209740 + ... + 317341.

It is an arithmetic number, because the mean of its divisors is an integer number (1989207468).

Almost surely, 2^28357484881 is an apocalyptic number.

It is an amenable number.

28357484881 is a deficient number, since it is larger than the sum of its proper divisors (3469834607).

28357484881 is a wasteful number, since it uses less digits than its factorization.

28357484881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527232.

The product of its digits is 13762560, while the sum is 58.

The spelling of 28357484881 in words is "twenty-eight billion, three hundred fifty-seven million, four hundred eighty-four thousand, eight hundred eighty-one".