28956271138 has 16 divisors (see below), whose sum is σ = 43867811520. Its totient is φ = 14333742576.

The previous prime is 28956271133. The next prime is 28956271147. The reversal of 28956271138 is 83117265982.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28956271133) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 852456 + ... + 885772.

It is an arithmetic number, because the mean of its divisors is an integer number (2741738220).

Almost surely, 2^28956271138 is an apocalyptic number.

28956271138 is a deficient number, since it is larger than the sum of its proper divisors (14911540382).

28956271138 is a wasteful number, since it uses less digits than its factorization.

28956271138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37641.

The product of its digits is 1451520, while the sum is 52.

The spelling of 28956271138 in words is "twenty-eight billion, nine hundred fifty-six million, two hundred seventy-one thousand, one hundred thirty-eight".