28133477865 has 12 divisors (see below), whose sum is σ = 48764695044. Its totient is φ = 15004521504.

The previous prime is 28133477789. The next prime is 28133477881. The reversal of 28133477865 is 56877433182.

It is a happy number.

28133477865 is a `hidden beast` number, since 2 + 81 + 33 + 477 + 8 + 65 = 666.

28133477865 is digitally balanced in base 11, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 16166868201 + 11966609664 = 127149^2 + 109392^2 .

It is not a de Polignac number, because 28133477865 - 2⁷ = 28133477737 is a prime.

28133477865 is strictly pandigital in base 11.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 312594154 + ... + 312594243.

It is an arithmetic number, because the mean of its divisors is an integer number (4063724587).

Almost surely, 2^28133477865 is an apocalyptic number.

It is an amenable number.

28133477865 is a deficient number, since it is larger than the sum of its proper divisors (20631217179).

28133477865 is a wasteful number, since it uses less digits than its factorization.

28133477865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 625188408 (or 625188405 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 54.

The spelling of 28133477865 in words is "twenty-eight billion, one hundred thirty-three million, four hundred seventy-seven thousand, eight hundred sixty-five".