28239834136 has 16 divisors (see below), whose sum is σ = 54775540800. Its totient is φ = 13633023264.

The previous prime is 28239834131. The next prime is 28239834149. The reversal of 28239834136 is 63143893282.

It is a self number, because there is not a number n which added to its sum of digits gives 28239834136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28239834131) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60861480 + ... + 60861943.

It is an arithmetic number, because the mean of its divisors is an integer number (3423471300).

Almost surely, 2^28239834136 is an apocalyptic number.

It is an amenable number.

28239834136 is a deficient number, since it is larger than the sum of its proper divisors (26535706664).

28239834136 is a wasteful number, since it uses less digits than its factorization.

28239834136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121723458 (or 121723454 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 49.

The spelling of 28239834136 in words is "twenty-eight billion, two hundred thirty-nine million, eight hundred thirty-four thousand, one hundred thirty-six".